People make fun of Melania because of her husband. Because of what she wears. Because of how she talks (muh don't speak English fluently people). Because she is standing up for an important issue.
I haven't heard many people poking fun at Melania.
She married a creep, and it was likely NOT out of love. But I don't fault her for that, nor do I fault her for standing up for such an important issue as bullying, even though her husband makes her stance mostly invalid. And I've never heard anyone ever make fun of how she talks. The only time I heard someone make fun of her clothing was when she visited Texas right after the hurricane--and let's be honest, it did look kind of awkward, didn't it? But ultimately, who cares about that? Her husband is the problem--not her. Anyone who doesn't see that is a fool.
On the other hand, Michelle Obama was literally compared to a gorilla, and also called a man.
Even if someone made fun of Melania for all the things in your post, it's apples to oranges when compared to that one insult against Michelle.
