Yikes. If this is the level that you're at, I really hope that you are trolling.
The point is that you don't have to agree with the definition, you can just recognize that it exists and that it's used. Then you can try to argue against the actual contents of it instead of the naming. So let's call "systemic/institutional racism" something of your choosing and go on about actually challenging the contents of it instead, alright? If not, this is a waste of time.
Is the massive BLM protests just a massive misunderstanding - nostalgia of former injustices rather than current ones?