user24218: First of all "Sadhu!" and much reason that reaches to good grow, but as just a meta-topic what's actually the primary base, good to give occassion to raise not only awareness for good grow but also possibility to give proper answers, citing the Venerables here (although, of course, some will use it to increase their demerits as well).
"We" in the question refers to receiver of Dhamma-guṇa (highest goodness), to householder, to people aware of higher and lower, not to speak of those gone for refuge toward the Gems.
Maybe good to add a sub-question: Who is the one who really gains something upwardly when giving proper regard, and who's the one who loses if failing? (e.g. the Kamma of reference)

user471: I feel lay persons should respectfully use appropriate honorifics such as "Venerable" together with the monastic name of the monk or nun, in the spirit of the Buddha's order to the monks in DN 16 and also the Patimokkha rules allowing monks to teach only those who show them respect (Sekhiya 57-72).
Showing respect to the teacher puts the student in the state of mind that is open to learning.

"And, Ananda, whereas now the bhikkhus address one another as
'friend,' let it not be so when I am gone. The senior bhikkhus,
Ananda, may address the junior ones by their name, their family name,
or as 'friend'; but the junior bhikkhus should address the senior ones
as 'venerable sir' or 'your reverence.'
DN 16


When his listener is not ill, a bhikkhu should not teach Dhamma if the listener:

has an umbrella in his/her hand.
has a staff in his/her hand.
has a knife in his/her hand.
has a weapon in his/her hand.
is wearing shoes, boots or sandals.
is sitting in a vehicle when the bhikkhu is in a lower vehicle or not in a vehicle at all.
is lying down when the bhikkhu is sitting or standing.
is sitting holding his/her knees.
is wearing a hat or a turban, or has covered his/her head with a scarf or shawl.
is sitting on a seat while the bhikkhu is sitting on the ground.
is sitting on a high seat while the bhikkhu is sitting on a lower seat.
is sitting while the bhikkhu is standing.
is walking ahead of the bhikkhu.
is walking on a path while the bhikkhu is walking beside the path.

Patimokkha rules - Sekhiya 57-72


24218: <p>First of all &quot;Sadhu!&quot; and much reason that reaches to good grow, but as just a <a href="https://buddhism.meta.stackexchange.com/questions/2661/should-we-use-honorifics-when-referring-to-monks">meta-topic</a> what's actually the primary base, good to give occassion to raise not only awareness for good grow but also possibility to give proper answers, citing the Venerables here (although, of course, some will use it to increase their demerits as well).</p>
<p>&quot;We&quot; in the question refers to receiver of Dhamma-guṇa (highest goodness), to householder, to people aware of higher and lower, not to speak of those gone for refuge toward the Gems.</p>
<p>Maybe good to add a sub-question: Who is the one who really gains something upwardly when giving proper regard, and who's the one who loses if failing? (e.g. the Kamma of reference)</p>
 471: <p>I feel lay persons should respectfully use <a href="https://buddhistbugs.blogspot.com/2012/08/the-confusing-world-of-monastic-titles.html?m=1" rel="nofollow noreferrer">appropriate honorifics</a> such as &quot;Venerable&quot; together with the monastic name of the monk or nun, in the spirit of the Buddha's order to the monks in DN 16 and also the Patimokkha rules allowing monks to teach only those who show them respect (<a href="https://www.accesstoinsight.org/tipitaka/vin/sv/bhikkhu-pati-intro.html#teaching" rel="nofollow noreferrer">Sekhiya 57-72</a>).</p>
<p>Showing respect to the teacher puts the student in the state of mind that is open to learning.</p>
<blockquote>
<p>&quot;And, Ananda, whereas now the bhikkhus address one another as
'friend,' let it not be so when I am gone. The senior bhikkhus,
Ananda, may address the junior ones by their name, their family name,
or as 'friend'; but the junior bhikkhus should address the senior ones
as 'venerable sir' or 'your reverence.'<br />
<a href="https://www.accesstoinsight.org/tipitaka/dn/dn.16.1-6.vaji.html" rel="nofollow noreferrer">DN 16</a></p>
</blockquote>
<blockquote>
<p>When his listener is not ill, a bhikkhu should not teach Dhamma if the listener:</p>
<ul>
<li>has an umbrella in his/her hand.</li>
<li>has a staff in his/her hand.</li>
<li>has a knife in his/her hand.</li>
<li>has a weapon in his/her hand.</li>
<li>is wearing shoes, boots or sandals.</li>
<li>is sitting in a vehicle when the bhikkhu is in a lower vehicle or not in a vehicle at all.</li>
<li>is lying down when the bhikkhu is sitting or standing.</li>
<li>is sitting holding his/her knees.</li>
<li>is wearing a hat or a turban, or has covered his/her head with a scarf or shawl.</li>
<li>is sitting on a seat while the bhikkhu is sitting on the ground.</li>
<li>is sitting on a high seat while the bhikkhu is sitting on a lower seat.</li>
<li>is sitting while the bhikkhu is standing.</li>
<li>is walking ahead of the bhikkhu.</li>
<li>is walking on a path while the bhikkhu is walking beside the path.</li>
</ul>
<p><a href="https://www.accesstoinsight.org/tipitaka/vin/sv/bhikkhu-pati-intro.html#teaching" rel="nofollow noreferrer">Patimokkha rules - Sekhiya 57-72</a></p>
</blockquote>
