Is AUTHOR wrong in the post ? POST : Okay, so there's a lotta context to this. It was my mom and aunts' 50th birthday yesterday, and after the main party us adults decided to go to a local bar to finish the night off. There's about 8 of us. So I'm 18, my cousins' boyfriend who is 19 was also there, as was a mutual friend of our family who is also 19. The rest of us (about 5 other people) were of drinking age. I didn't expect to drink at this place since I'm not 21, but anyway. 

We get to the bar and my mom orders a pitcher of beer, everyone starts drinking, including the two other underage people with us. They were not obvious about it or anything, just taking sips off other people's beers occasionally. This bar is kind of a dive and I was told they didn't really take drinking ages seriously. I order an iced tea, and I'm sipping on that for the first 15 minutes or so that we're there. My cousin decides she wants me to have some beer too so that I am not the only one not drinking so she switches my tea and her beer. I figure, the other underage people are drinking and it seems fine, so why not? I take one sip of her beer and switch the cups back around. IMMEDIATELY, an ugly old waitress storms up to our table and starts yelling and demanding to see my ID. I am not exaggerating, she was so loud she got the attention of half the damn bar. I tell her I took one sip and she says "I've been watching you drink beer since you got in here!" Now I'm pissed because she's outright lying. I didn't get the chance to really say anything to her because after she said that she stormed off. 

I'm dumbfounded at what just happened, embarrassed because of all the eyes that were now on me, and it made the atmosphere at our table incredibly awkward. After a minute conversation resumes but I'm still very uncomfortable because this lady seems like she's watching me now and waiting for me to try something again, as were some other members of staff. This continues the rest of the time we are there. Since it is my mom's birthday I didn't want to cause a scene or anything so I just sucked it up and stayed, even though I'm still very uneasy being watched by all these staff and that whole situation definitely soured the mood at our table.

After we finish up (maybe 45 minutes after the incident), we get in the car and as we are driving my mom starts in about how I shouldn't have drank anyway and that I should've known better. I tell her about the other two underage people with us who were drinking a lot more than me without any problems and that didn't seem to change her opinion of what happened. After we get home I tell her that it kind of irritated me that she basically defended the actions of the waitress, and that if it were my kid in that situation I would've up and left the bar with them. I am definitely pretty disappointed that nobody took my side in that situation at all. AITA in thinking that?