I have a friend who is acting very weird and is really getting on my nerves.

I need help analyzing why does he act that way (If you can pinpoint to a specific disorder or issue or analyse him as much as you can).

He argues all the fucking time on meaningless matters with whoever he can. he argues just to win arguments. He can never be wrong unless you have solid evidence that you can show him at the spot (he never uses clear evidence). He picks mostly on his friends too. (usually laughing like crazy at a minimal mistake while exaggerating how bad it was) And he insults a lot.

I can't win an argument with him even on things that I know im right on (ex. life decisions) I just get really confused trying to explain myself.

Recently he started telling me what to do every time I'm asking of his opinion about any subject (which I always do in conversations with everyone) what do you think made him start doing it?

Inb4: I can't cut him off for now because of reasons that I can't explain here.