That answers the question, I guess. 

Anyway, jokes apart, @OP, it basically depends on what you are here for and what your intentions are, and your intentions can't be hidden for long because your posting behavior and the efforts you put in will give it away. So if your primary purpose behind joining this forum is to learn, share knowledge, and participate in constructive discussions, you will never see the unfriendly side of the forum. However, if you are here with a different purpose, such as earning money, spamming, running scam services, selling unauthorized and illegal stuff, and whatnot, then you are surely going to see how unfriendly the friendly people can get in here.

Every single person in this world will have both a friendly and an unfriendly nature. It depends on your behavior whether they choose the friendly or unfriendly way to deal with you.