Pretty much what SalmonGod said. I've got family who are Trump supporters, despite having no reason to be so.
The racism? My uncle is a roofer in California. Working that kind of job, in that location, you're bound to have a good 80% of your coworkers be Mexican, and it's not unreasonable to assume that not all of them are completely legal. My uncle loves these guys, and has had an extended network of Mexican friends and their families forever. He invites them home to have dinner with his family, and is always in awe of their work ethic and friendly demeanor.
But when he hears Trump talk about immigration? "Those god-damned Mexican illegals keep hopping the border and ruining everything!"
My uncle's family doesn't make a lot of money, partly because they don't exactly have the highest-paying jobs and partly because he's hilariously bad with money, and numbers/math in general (as a lifelong fisherman, everything is exponential). He firmly supports and believes that Trump is doing what's best for him by cutting social security and giving tax breaks to the uber-rich.
My uncle was diagnosed with kidney cancer a number of years back. Being in a lower income bracket, they couldn't really afford regular medical insurance. And trying to get insurance after you've been diagnosed is a fool's errand, since it's now technically a "pre-existing condition".
But that was back when ACA was in force, and it was specifically through the ACA that he managed to get the operations and specialist treatment necessary. He's been 100% cancer-free since 2015.
When he hears Trump talk about medicare? "That god-damned Obamacare, destroying the medical system and draining our economy dry!"
Muslims, homosexuals, blacks, economy, medicine, science... My uncle has lived a life that directly opposes Trump on almost every single topic. But he listens to Trump, and he believes him. He believes Trump is an expert in every field he claims to be an expert in. He believes Trump is the greatest negotiator and diplomat to have ever lived. He believes that Trump will, truly and wholly, make America great again.
And for every specific instance where Trump's speech conflicts with my uncle's actions? "That doesn't count", or "You don't know enough about it to say".
And those are some of the people who still trust and follow Trump. The ones who simply cannot find a conflict between what Trump says and reality.
The others are people who are just as despicable as Trump, and are happy to finally have an appropriate representative in office.