Why is it ok for every race except whites to be racist but when a white does it then guns comes out?

I hate double standards especially when it comes to race. Blacks can complain about their ancestors being slaves but guess what so can lots of people. Blacks aren't the only race to be enslaved and they definitely weren't the first. They have no reason to ***** about it. Especially since they were freed 150 years ago. They can't play the race card forever which is what they are going to do. They blame whitey everytime something bad happens to them.