This is going to turn into a **** storm, more than it already is. It's good that all of this has come out now though, as it should really help clamp down on institutional racism, and other forms of abuse, and bring to light things which some people don't even realise exists, or they know it exists but deny it.
I've been in various dressing rooms and various employment where people who were and still are very much good mates, used and still use racist/ageist/fat shaming/sexist/degrading and every other type of comment against each other, and both sides genuinely laugh it off, and keep upping the anti. Hard for some to know where the line is, and not overstep it, and that is if there even is a line between some people, with most there is, but with some there isn't.
I've also been in many situations where people have ganged up on someone, and the victim has laughed it off, when they've clearly done that as a defence, that's a horrendous thing to experience.
I'm sure many on here have had the same experiences over the years.
Apologising for racism certainly doesn't make it ok though, even if the apology is accepted.