This post is in Silly, Random and Fun because I want to emphasize the comedic elements in the comparison.
I don't seriously compare our demented Chief of State with the unimaginably evil historical figure Adolph Hitler. Hitler was a monster and Joe Biden has neither the intellectual nor evil capacity to be a Hitler. That fact is what makes the meme especially funny!
To quote Ricky Gervais, "You're offended? I think it's funny. That's why I'm happier than you."