Let's take something (presumably) less polarizing: the word "Literally". To some people, it means "an event that actually is/has happened" but it can also be used as a synonym to the word "figuratively". This can create conflict or misunderstanding when 2 people have different expected definitions of a word. Both are accepted by large populations, and if you use one in a way that has not been accepted by the person you're speaking to, you're not "wrong" you're just having a misunderstanding.
You can argue the validity of each definition, but there's no objective right or wrong here. If I say "Black people can't be racist towards white people because they don't have the institutional power to do that", and you respond "anyone can be racist" we're not having the same argument. You're just arguing semantics while I'm trying to make a point about the world.
I disagree. This article pretty well sums up my thoughts.
My point is, don't let people commit racist actions (I don't care about jokes) because they may have 'less power' due to their race.
By contrast, the traditional definition of "racism" that so many are vociferously defending here is used almost exclusively by white people. Think about that.