I already answered this question, multiple times. It has nothing to do with being confrontational.
It has to do with being RUDE.
Rude: discourteous or impolite, especially in a deliberate way [1]
[1] http://dictionary.reference.com/browse/rude
Nobody owes you ANY citations. You are being LAZY by demanding them. That LAZINESS is RUDE. If you disagree with someone, get off your lazy ass, go on Google, find evidence to the contrary and share. If you're too lazy to do that, then STFU instead of posting "citation needed". That doesn't add to the discussion. It's nothing more than an expression of displeasure with absolutely no effort to enhance the conversation.