Well, if you want to drive down to vote and fight with a bunch of fat bitches just to be turned away like that guy was, and think shoving MAGA in their face is more important than just voting like that guy apparently thought, more power to you. But the bitches running the polling station, no matter how wrong, will have the final say.
Just like a cop will have the final say even when he is totally out of his rights.
Me, I don't own any MAGA gear. Trump supporters might like it, but it is really intended to be antagonistic more than promotional because of how strongly some people are against him and no one switches to Trump over a tee shirt. All it does is put you in leftist's target sights to dick with you. They will fuck you over, key scratch your car, anything they can. I prefer to keep my politics to myself and not use politics as a polarizing element in non-political everyday life.