@seachanger I think you're going to have a tough time pinning down anything on mastodon since users only see stuff from the list of accounts they follow and everyone has a different list. If people are seeing the racism you are insinuating it's because they follow racists.
I'm sure that there are some vastly underrepresented demographics and viewpoints. Maybe you can find some way to quantify that? ¯\_(ツ)_/¯