Ever since Spez took over, Reddit have been incredibly heavy-handed when it comes to enforcing their rules against inciting or glorifying violence, even if such a comment is directed towards people that are objectively hated, like nazis, pedophiles and child murderers. To that I'm not even remotely surprised that you got banned.
Even posting that Nazis deserve to be punched in the face can get you a permanent ban from Reddit... You know... the people who over 80 years ago were responsible for gassing 6 million Jews, 6 million Russian POWs and thousands of homosexuals and political dissidents.
Weight is one of those things that most people can largely change about themselves. I agree it's a lot harder to regulate your weight when you have conditions that reduce your mobility and make you burn far fewer calories like ME/CFS or fibromyalgia, but the basic principles of thermodynamics still apply.
Trump isn't one of those people with a debilitating condition other than his age. He's genuinely an unpleasant glutton who lives on a diet of Big Macs and Diet Coke.