Trump is the president of the United States, Republicans have both the Senate and the Supreme Court, and I can barely go two seconds without hearing the perspective of people who voted for Trump. There is an entire news network that acts in an almost official capacity as the Republican party press arm. What on earth makes you think Reddit is the only major place that people could discuss "issues"?
People closing down your internet forum after a billion warnings and blatant violation of the rules of the site is not discrimination. If anything The_Donald was allowed to stay around for way longer than most other subs that did the kind of things it did, precisely because they did not want to have to deal with the tremendous number of communication channels available to Trump supporters to complain about it.
I do, but that doesn't change my point in any material way. To act as though Trump supporters are victims of systematic censorship when they literally run the United States is just ridiculous. And in any case, Reddit is not a government-sponsored social media service, and even if it were I very much doubt they would not have provisions for removing objectionable content (given how other government sites work).