These ridiculous classes are usually mandatory for employees. The last one I had to endure was 12 years ago. I can imagine how much worse they are today.
I worked for a large computer company from the late ‘70s to the early ‘90s. It was in the early days of this stuff but we had various “sensitivity” training sessions from time to time. One of the last ones before I left we had the management staff of the group I worked in. The session was run by our HR lady (black). Somewhere in the early part of the session she asked each one of us a question and asked for the first thought. “What do you think of when you see a Puerto Rican?” The fellow who got the question answered “body odor.” The session ended there. I don’t recall any retribution.
The next company I worked for was much smaller with quite conservative management. Every year the HR dept would send a 1/2 page memo to everyone basically saying “treat everyone with respect.” That was it.