I dont mean to be rude but - When you're too lazy to be polite and just want to be a pain

When you're too lazy to be polite and just want to be a pain in the ass.

I don't mean to be rude but your face is so ugly I'm getting a headache.

I don't mean to be rude but you're the reason I failed math.

I don't mean to be rude but you're a total dork.