apart from getting a little irritated when someone notices (but I usually make up some story), that or say " I don't know", I don't care either.

it's actually surprising how many people have asked me, I've replied saying I have no idea where it came from, and they left it.

either they are completely taken in by that statement and are actually quite stupid, or they actually don't care either.

well they do say: learn to love yourself before others, perhaps this works in the same way.

welcome to PC, by the way. I hope it helps