When people are protesting about racial injustice toward some minorities, saying "All Lives Matter" is dismissing their concerns. It's like when someone goes to the police department saying "You need to protect me from a murderer" and an officer goes "Yeah, we need to protect everyone from murderers." Yes, that's true, but that's not a very helpful response to someone asking for help.
Likewise, the whole academic evaluation based on merit dismisses the idea that our current "objective" means of academic evaluation may not be as objective as they should be when considering race. Yes, we should evaluate students based on "merit" but we need to reconsider whether our current methods measure "merit" accurately.