Because supporting him pisses of leftists. If everyone just ignored this dweeb instead of engaging with every stupid thing he does they'd stop giving him attention.
I'm not generally a critic of what you post, but this time I would have to say that you are, in fact, giving him unnecessary attention. He's a dumbass kid who is no longer useful to the GOP.
Just filter the unwanted user out of the posts you see. The app I use for Lemmy includes this feature. I use it to clean up my feed from gallowboob-type ubiquitous posters, as well as any headline that includes the words "slam," "slams," or "slammed." I can also eliminate any headline ending in a question mark, as the answer is an automatic "no," so the question is not worthy of my attention.