People were mad at him before the Tucker shit. They had a fit simply because he sat down with Donald Trump even though he shopped his ideas to both Trump and Biden and Trump was initially the only one to agree to meet with him. Whether you trust them or not, the people in power are the ones that can make change happen. If he gets the chance to meet with a presidential candidate and pitch his ideas, is he supposed to not do that and just push them on a bunch of people who have no power instead?
Depending on who somebody is you should have enough discernment to know whether or not you'll be taken seriouly and if it's a waste of time. Regardless of what position they hold, it still doesn't mean that they're not just fucking around. And given the rhetoric Cube has been known for for decades most people thought he'd be smart enough to know that Donald Trump ain't taking him seriously. So the vitriol he had for the Dems, and it wasn't that they initially declined to meet Cube himself stated he wanted a personal one on one meeting while they wanted him as part of a larger group of Black people to speak with, meanwhile seemingly being convinced that Trump was going to actually listen to him seriously. Yeah that threw people off.