Appropriate response to misattributed title? There are many questions here on how to address someone by their title or current status.  

What should one do in the case they are addressed by a title they do not have?

Some example of this:

A student submitting a paper and the editor emailing using the Professor/Dr. title.
A PhD in a research lab (not university) being invited for a talk and a letter stating "Dear Professor..."
A researcher (non PhD) being referred to as Dr.

If this is too broad, the question can be edited to just one situation.

In this type of case, should one reply and directly address the title?
The standard answer to such issues is to ignore. By and large, these situations arise because the editor etc. did not care to look up the recipient's real title. There is no malicious intent, actually there is likely no intent at all other than trying to use a catch-all title that the editor assumes will not offend anybody (typically Dr. or Prof.). No harm is done by not rectifying this error, and indeed spending more than a short chuckle on this is too much effort.

(also, being addressed by the wrong title is, at least for me, so common that I mostly stopped noticing it)