It's stupid, but I hate it when people come up to you and go "Hey best friend" or even just "Hey friend" when they're just an aquaintance, or when someone's like "Oh my god, I love you" or something. I guess it's cause those aren't words I throw around or use loosely with people, so it irritates me when people use them with me unless it's the truth, which 99% of the time it isn't.
Like a few days ago someone I work with came up and was like "I haven't seen you for so long! I missed my friend! Hey, let's get take our lunch together!" I'm like "Yeah, okay." Then she ditched me without saying anything. Yeah, friends don't do that.
So yeah, that's a mental groan when people say it to me.