No, it's not nice. But the frequent memes comparing Trump to Hitler more than justify (imo) a preemptive meme, like this one.
When I see a Trump/Hitler meme, I usually reply telling the poster what an ignorant buffoon they are, and point out just a few of the things Hitler did that would have resulted in exactly what this meme says, which Trump has come nowhere near doing.
Not liking Trump is a person's right. I absolutely have no problem with that.
Hating him because the left-controlled media tells you he's as bad as Hitler, when you have no clue how bad Hitler and the Nazis actually were, is a sign of a very ignorant person who cannot think on their own. (and yes, I left off the "imo" for this last comment on purpose.)