I think perhaps talesin confused you with someone else?
On the OP, I've observed it seems very much human nature to want to push their way of thinking on others. You see it all the time in a basic form of arguing over brands. You prefer Chevy? Ford is way better. You mix Pepsi with your rum, Coke is way better. Even on behavoir levels, extroverts don't get introverts and apply negative labels because they don't act like them. Or vice versa. And we quickly judge others based on dress, appearance, lifestyle, what they drive....all based on a perception that our own ways are the "best" ones.
Politics and religion are the more extreme forms of this negative nature. That's when things get ugly.