I noticed that some people on stack overflow seem a bit mean, and I was wondering if we could try making a bot in order to answer questions politely be feeding it information from our ask page
You are definitely not the only one.
I'm not sure what it is about stackoverflow that lent itself to develop such a user base.
It could be the strictness about what questions are allowed to be asked or that all the common users are professional software engineers.
I don't see that becoming a problem with repl.it though, since the user base is relatively younger than stackoverflow and the question guidelines aren't nearly as strict. Though it might have its downsides, relaxed rules will permit non-serious answers.