Bad / Unfriendly
intolerant - Refusing to allow others to do or believe things that you don't agree with.

When people try to dialog with others, and both are intolerant of each others' points of view, it often just degenerates into a shouting match, with neither side listening.
divisive - Causing disagreement or hostility between people, tending to disrupt unity or harmony.

The election was fought over the deeply divisive issue of immigration, and people on either side of the issue can't see things from the other point of view.