No matter what we do, we are always going to have Us versus Them moments. We can separate, yell or talk to each other and draw a truce. You won't agree with everybody. It doesn't mean the other person is an idiot.
Conflict is going to happen whether you want it or not. People will butt heads. Sometimes when you least expect it.
Civility is not something that automatically happens. Civil societies come about because people want them to.