You keep saying he is complaining about himself being treated unfairly. He's not complaining about his salary or privileges that come with being rich. It's about discrimination in the criminal justice system. And as far as I know, he hasn't said that he personally has been mistreated, harassed, or shot by cops. Sometimes a person can be concerned about seeing a problem in society, even if that problem doesn't affect them directly. And when you see something wrong in your country, especially a democratic country with rights like freedom of speech, then the right thing to do is to try to change your country to fix the problem.
You don't expect a democratic country to exile people for speaking out. Is that really the world you want to live in? I know you were probably joking about the deserted island thing. But in the past year or so it seems like a lot of things that would have been passed off as a bad joke are actually taken very seriously by some people. And sometimes people use a "joke" to test the waters to see if their controversial idea might actually have some support. If you're not careful with your jokes, people might actually think you are serious about kicking a black citizen out of the country for complaining about discrimination.
You said earlier you are not sure whether he has a real reason to complain or not --- you don't know much about it. I'm not sure if you are the kind of person who is curious about things you don't understand, or if you like to learn about things that challenge your preconceived notions. But if you are, you might want to watch the movie "13th". It's on Netflix. I thought it was really interesting, and I learned a few things about how the criminal justice system is applied in this country.
I'm white and I've seldom dealt with discrimination personally. If you had asked me 5 or 10 years ago whether the criminal justice system is discriminatory, I would have said it might be a little bit, but not much. And if you'd asked whether blacks have a greater chance of being shot by police, I would have said that it probably wasn't a big difference. But now we've seen a huge number of videos that in my opinion show black people being shot by police in unjustified killings. In the past, I would have had trouble believing it. Now everyone has a video camera on their phone, so we see a lot more of what goes on. It's changed my mind, and I do think the country does have a problem with discriminatory policing.