Is AUTHOR wrong in the post ? POST : I absolutely can't stand when a cashier makes a comment on what I'm buying or asks why I'm buying what I am. The most infuriating one was a while ago where a cashier at a grocery store was amazed that I was spending so much money on a pineapple, because you can get them cheaper elsewhere. Everyone in line was staring and the cashier wouldn't let up about how stupid it was to spend so much money on a pineapple.

Fast forward to the other day, I was buying half a dozen peppers to make stuffed peppers for some friends, and this same cashier asked "why the heck do you need so many peppers?". Wanting to just shut them up and make it awkward so they would stop, I said "oh, I'm making a bunch of stuffed peppers for the potluck at a swingers party later." And it worked, they just said "Oh" and stopped talking. I get that they are just making small talk, but I feel like it's inappropriate to comment on customers purchases so I wanted to teach them a lesson. 

AITA for doing it in that one instance? And WIBTA if I continued to use similar responses if different cashiers question my purchases? 