No, we shouldn't justify one terrible behavior just because another terrible behavior exists. WTY? Sure, when I was
6 years old, I believed that "He started it" was a valid excuse for my bad behavior. Now that I'm an adult, I realize that's silly and childish. Even worse is saying, "He called me a bad name so I tried to bash his skull in!"
Let's take your position and analyze it. If using a racist word is a bad enough insult to warrant physical violence, then the other side of that equation states that accusing someone of using a racist word is also bad enough to warrant physical violence.
So, in the case of Myles Garrett the evidence suggests that he most likely is falsely accusing Rudolph of using the slur. Given that knowledge, is Rudolph justified in assaulting Garrett with a blunt object because of that name-calling?
Words only have the power that we give to them so why the yewt are we trying to give them even more power these days instead of trying to find ways to neutralize them? Yes, it is disgusting that racist attitudes still exist and are sometimes publicly expressed, but the only power those attitudes have is what we grant them. MLK, Morgan Freeman, and many others who know MUCH more than you or I do what it's like to have words and attitudes like that used against them advocated to take the power out of those words. I'll take their opinion over those trying to make uncontrolled outrage a default response to insults.