Okay, all mine fall under annoying instead of stupid, but here goes.
Along with Cynder, I hate when people ask "Are we friends?" "Are you mad?" "Do you like me?" etc... but the one I can't stand at all is "Why are you hurting me?" Gaaaah. Seriously. It's not like my intention is to hurt you when all I'm being is brutally honest. I can't help that about myself. I'm not one to sugar coat.
I typed like three hundred paragraphs of things that annoyed me. I think I'll stop myself and start a thread or find one an already existing one.