He is rich, and people are nice to rich people because they think they will get some, 2 levels of denial, the second being that he's a good guy.
Furthermore, his strategizing is laughable to people that understand, but very effective on his target Trumpkins. Very simple, the left says he's bad, so he's cool. If you're against him, you're "one of them".
There's a few other reasons, do you actually care to know?