I think we both agree that if something intentionally targets one group over another in an attempt to treat them unfairly, that is unfair. Where I think we differ is that if something doesn’t target some group specifically, but it just happens to affect one group more than another, then I don’t see that as unfair and you, if I interpret your position correctly, see that as a unfair.
However, I suspect I can find a case you would disagree with. Like men are more violent, so laws that punish violence are going to, imo completely fairly, disproportionately affect men. Are laws that punish violence unfair?