I think I agree with their point though (despite their comment being divisive). In my actual real (off the internet) life people with diverse opinions and backgrounds all get along more or less fine and manage to "make it work".
If you really think everyone is totally divided and falling apart I recommend just touching grass and getting off the internet. You'll realize it's really not that bad
I don't have an issue with people who have other opinions, and I found that off the internet it doesn't seem like most other people do either. Everyone pretty much gets along
edit: seriously, just go outside you'll realize none of this stuff is actually a big deal off the internet