What do you think about me telling my friend that he was being a dick?
What did he do that warrants you call him a dick?
He's just been annoying lately.
Sometime we just get a little annoyed with our friends or they do something that annoys us. Calling him a dick or insulting him isn't the right way to deal with it if you consider him to be a friend. Just let him know what he's doing and talk to him about it.
I think he should be the one apologizing to me.
Everyone has moments when they annoy other people. You wouldn't want someone calling you names if it happened to be you, right? It's wrong to call some names because you feel annoyed.