He doesn't need to hire an expensive PR firm to fix this. He obviously has only a few choices - either he publicly rejects the meme (alienating those who like it) by sucking up to Xiden and the 'Crats, or he could go the other way embracing the meme and alienating 'Crats et al who dislike it. 

To avoid alienating anyone, he would merely have to (drum roll please) change his given name (his surname "Brown" is not the problem). Companies whose "brand" has been damaged (like Facebook, Aunt Jemima syrup, the "Black Cow" candy bar) do it all the time. It's SOP for such issues. 'Name becomes a liability for any reason, just change the name. 

Duh. 

It takes about a month to get a given-name legally changed. My housemate did it in the '80s. Virtually all reasonable requests are granted by courts - judges don't really care why you want to do it. Unless you're trying to avoid legal accountability (debt/liability) or are trying to stir up trouble (calling yourself Adolf Hitler or Osama Bin Laden) judges don't much care. 

All one has to do is file some boilerplate legal papers - pay some administrative fees and appear briefly before a judge to swear in court that you aren't trying to dodge debt, defraud anyone, etc. The judge yawns, endorses the change, the paperwork is processed and voila!! 

An even more-simple way would be to keep, "Brandon," but add another name like Bob or Fred or Dweezil, then stop using "Brandon" and use the other as his first name. Millions of people have multiple given-names and can legally use any of them as their "first". He could become Dweezil Brown for the rest of his life. So the crowd would chant, "Let's go Dweezil!"

Problem solved.

He won't even need to hire a lawyer; he can do everything himself or let a friend do it for him except for personally signing the papers and making a single brief local court appearance. 

So, should I start my own, "celebrity crisis-resolution," service? heh