Yeah, groups generally don't change for the new guy with no social capital, especially if he's the only one who feels that way. "You're fucked" might not be the whole truth of the matter, but it's probably pretty close.
Like Positive said, you're almost certainly not going to make a dent in their actual worldview. This is more about not wanting to hear that shit constantly or to feel like an enabler for letting it slide.
My advice if you want to try talking to any of those guys: preemptively concede their good intentions, be explicitly nonjudgmental, and frame it as asking for a personal favor rather than challenging their behavior. It's kind of a bullshit way of doing things, but IME you'll have a much better shot that way rather than any sort of direct Real Talk, even if it's relatively calm and respectful. Actually calling out someone you don't have a strong relationship with is just asking for a defensive crouch. Nobody wants to be told they're a bad person, and dudes especially tend to dig in to avoid feeling submissive.
"Hey, I know you're just joking around and not really racist, but ever since I served with some black guys overseas, hearing that shit bugs me, even if I know it's not serious." It puts them in a position where they don't feel threatened, can feel good for having done you a solid, and can have a chuckle at what a sensitive plant that Biz guy is. Of course you know the lay of the land better than I would and maybe it doesn't work at all, but at least you gave it a shot and there'd be less chance of backlash than going to management/being more confrontational.
