Apparently some people are.
Terraria Community Forums
Bezixx
Techhunter_Talon
I can think of a few but I haven't seen hide nor hair of them since taking them off. Nor will I name them.
Aesir
Well, it's a nice thing to have an ignore button. What if you meet someone agressive, or someone your just don't want contact with? Plus, it's part of xenforum interface, I guess.