I find that most individual Christians can transfer smoothly from church to church, without people wincing, "You're from that denomination!"
But when they talk about other churches, they compare like we are competing sports teams. It is usually based more on a sense of pride, than on offense over doctrine.
I also hear preaching from the pulpit against this or that ministry, or derogatory slams on the forum... but I don't see many face-to-face conflicts.
In my opinion, people are more unified than they say they are. They see most other Christians as brothers in Christ, and would step out to help if others were in trouble.