Insulting people I voted for with vile and bile is demeaning to me. Maybe I'm too sensitive. But, if I called the people you voted for "orange headed Hitlers and tyrants, etc., you might take that personally as well. I think sticking to issues you disagree with and why rather than ad hominem attacks is more enlightening and less personal to supporters. It might prevent comebacks that just get threads closed.
My understanding is that an ad hominem attack consists of personally insulting your debate/discussion opponent instead of addressing the issues under discussion. This is not the same thing as insulting political leaders that are being discussed.
Speaking only for myself, you can insult any politician you like, including any I might support, it won't bother me. But more generally, when a public figure says derisory things, they're going to be ridiculed mercilessly , that's just the way things are. Been going on forever. Pick up an early issue of Punch for examples. If what you're really complaining about is the often uncivil comments about your current President, I guess I can understand your displeasure, I also deplore the current state of public discourse, but unfortunately that ship sailed a long time ago. And it is your President himself who is the most guilty in this regard. I think of the paper towel tossing incident, for instance, but that's just one example. The occasions are too numerous to list. On occasion, you have personally dismissed this behaviour as Trump just being Trump, i.e., outrageous. Well ok, I guess, but that kind of behaviour is going to be met in kind and no one is going to apologize, you had better get used to it. Besides, it's pretty late in the day to worry about it now.