I wasn't exactly polite, and while what I said in post-game lobby could be interpreted as "hateful speech", me being reported isn't really about him being upset about what I said.

This is a spite report. He's displacing his own anger associated with getting played.

Someone else called the town " idiotic" (before I even said anything) but he didn't report that person because he already felt dumb for carrying out a mislynch on them.

Frankly, I don't think a generalized statement not directed at an individual should be classified as "hateful speech", but I did lose my cool, so I'll take the warning if you feel like I deserve one.