In the old movie, Gremlins, feeding the gremlins empowered them to grow more, well, gremlin-y. Likewise, human gremlins have hit on similar strategies, making themselves so obnoxious that they provoke enraged responses, allowing them to cloak themselves in aggrieved victimhood, martyrdom and defiance, and setting things up for more rounds of the same, not to mention side dishes of law suits. The Westboro Baptist Church gang was expert at this. So is this fellow, apparently, who is making a career of it. And protesting Trump rallies just gives Trump more material which is essential to the embattled resentment narrative he trumpets to his fans.
So don't feed the trolls.