Lots of people don’t like Trump and they’ve never met him either.
It’s very easy to criticize someone when they blog about themselves for over a decade. Don’t take my word for it though, there are plenty of people out there that have actually gone into detail about this (several as a result of interacting with him directly) and they’re just a google search away.
Edit: That said it’s much less stressful to just pretend he doesn’t exist and criticize Discourse specifically, since that’s actually what we’re dealing with on the forums now.
Personally I have my fingers crossed that some sort of paginated alternative (via plugins, external scripts, or whatever) pops up.
Edit 2: I just browsed the forums with JS disabled for a bit and it actually does look like pagination is supported. It should be possible to write a script that nukes the infinite-scrolling and forces pagination without actually disabling JS globally. Getting more than just a next/previous page button would take some effort though.