Yeah a social construct is only theoretically meaningless. In society it's everything.

Person A: "cops should stop overwhelmingly killing people who look like me!"
Person B: "fascinating, how did you come to this conclusion? You know some cops are good people, and even look like you."
Person A: "there's plenty of evidence, here..."
Person B: "oh I see your problem, this is about race-based bigotry - actually that's a social construct, so it doesn't matter"
Person A: "look it's pretty simp--"
Person C: "pardon me, but the real problem is how both sides keep talking about race"
Person B: "agreed, but have you considered purely economic factors..."

And on and on and on. But thankfully social constructs can be changed. We could make race a meaningless factoid about a person, like eye colour, but right now it's not. So that's the reality we have to deal with (and try to change).

Anway I'll stop there at the risk of becoming "Person D" here.