"Orange man bad" is a meme or just shorthand to refer to anti-Trump bias. It's meant to be dismissive of it and is rather widely circulated.

Not OP but I don’t think so. He’s remarking on the phenomenon on how there’s a few people who have a strong bias against Trump and anything he touches

Sure, but he's doing it in a very inflammatory way. There are many alternative phrases which would have expressed the same idea without making it look like he's picking a fight.