Trump never claimed to be an ally of Jewish people.

He’s long been known to be a narcissist. He’s only ever cared about himself.

Kanye has a slightly different history and projected image.

There’s an added sting on betrayal to it.

Doesn’t make it right; also doesn’t mean that the reaction isn’t rightly perceived as a betrayal as well given that Kanye has long been known to suffer mental disease.