Personality Traits You Hate

I really have a hard time with people who refuse to admit they're wrong, no matter how retarded their argument or blatantly obvious the proof against their point is. People have been shooting along the lines of this already, though.

One I haven't seen yet but I'm sure some of you can relate to. Me being somewhat musically inclined, I absolutely can NOT stand someone (or people) showing their musical talent they think they have but obviously do not have. This is particularly the case with singing, not so much with other stuff. There are some songs I seriously hate because whenever I hear the actual songs (which I otherwise might've considered decent or even good) they remind me of some other instance where someone failed miserably at trying to sing it. It's torment, I tell you.

I know I probably sound pretty harsh in saying this, but 99% of the time I feel like the person(s) should never have even tried.

Jam it back in, in the dark.