Rule #1 at the academy is leave your ego at the door. Sometimes I think it should be wash your ass and your gi, but thats a whole other thread. Everyone has some amount of ego and it takes time shape it just like any other move in jiu jitsu. Roll with a new guy put your hand down on the mat in his guard, wait for a kimura, shake your arm or slap the mat to get his attention, and the new guy locks it up. You tap and he gets a big grin on his face and tries to hide it but can't. A year later this same guy comes up and tells you "I cant believe I actually thought I caught those submissions". But you have a different kind of new guy come in. The one who's trained in his backyard with friends or at a local ninja school that you haven't heard of. And which you shouldn't have, because they are ninjas. You roll with him first to see where his level is, make sure he's not a spaz and wont hurt other students, but mostly so he wont hurt himself. You move around on the mat for a min to get a feel for the guy, catch a few submissions, put him in bad positions to see what he'll do, and then put yourself in bad positions to see what he'll do. Which is where the trouble begins because the next thing you know hes telling someone "man I almost had him in a choke or whatever move". Yes dumb ass, I must have used all my jiu jitsu magic to catch you the first 10 times and ran out for number 11. Its not that hes saying whatever to people that gets me its that this guy will never get it.
you are correct. it shouldn't bother you. who cares what some nobody thinks/says/doesn't get.