If you move this comment one level up it sounds like a clear distinction from the racist right. Making it clear that GP was engaging in a false equivalence. One might say: In a different context this comment is accidentally leftist.

You see the context in which you say things matter. If you should “all lives matter” in response to the death penalty, I bet you’d be met with a ton of leftist support. However if you say it in response to “black lives matter” it is pretty clear that you disagree.