People who think others with different opinions or perspectives are stupid are generally pretty stupid themselves.

It's a big wide world out there. Lots of people have pretty different life experiences. These experiences create a very strong filter that strongly colors the way they see the world. The smartest people tend to realize this, especially once they're older than 22 or so.

Smart people also realize that someone who isn't as smart as they are can still give insight or perspective that smarty pants could not understand on his or her own.

Trying to be nuanced on reddit is like pissing into the wind. But watersports can be kinda fun sometimes.