I like "mouth breather" from Stranger Things it has the right sound and pacing to make a good insult but doubles back as a wtf thinker moment. In an emo moment where the person wants to auto respond to everything in argument, it is funny to manipulatively force them to deny it, then call them out on how stupid they are for saying they do not breathe.
Hahahhahahhahahahhahshajhahahahahhashahhaahahahahahahahhaha what a funny, original joke! I’ve never heard that before, not even a single time in my entire life! You should do standup!