I don't, generally speaking, consider myself arrogant; I'd favor 'cranky' or some similar adjective. I try to avoid a "piling on" type post where I'd be the 10th or 20th to basically support a thread base since by the time I get there, there's almost nothing left to say that hasn't been said previously.
I haven't focused on what topics or opinions we don't agree on. Disagreement can lead to debating and forcing oneself to examine his/her own views to validate the foundations required to support them. I have no problem with that.