As a white straight male, the only inkling that I may have been discriminated against in the workplace my entire life has come 100% from right wing media outlets and conservative politics. I have never been on the receiving end of any decisions that I felt that I was unfairly judged based on the color of my skin. I'm a single data point of course, but it would surprise me if this was not more common. But of course reporting the absence of discrimination isn't really newsworthy. Maybe we the un-oppressed need to stop being so beige about it or something?
I've seen in larger companies there's a lot of career growth initiatives focused around the typical groups that DEI have been deemed oppressed. So if you're not in those groups you're left out.
Now whether it's right to have those or not to "balance" any sense of perceived structural inequity is a different question altogether. But I can totally see how a white straight male would feel discriminated against.