I think it's really easy to construe "get over it" as dismissive of a marginalized group's concerns. That's how it comes across to me. If it needs context to seem less so, it could probably use better wording.
So would you say to women that they should just get over discrimination and harassment in the workplace because it's inclusive, for example? I'm sure you can think of some more extreme examples that go beyond that both in magnitude and into parts of a person's identity beyond gender.
Please understand that marginalized groups already receive special, negative treatment. Claiming that they're being included by ignoring those very real parts of their lives doesn't sit well with me. If you are the type of friend that ignores the suffering of the people you are close to and treats others well only so far as they are "normal" and don't require special treatment, that won't make a fuss when you call them names or make them the butt of a joke to be "inclusive", then I don't envy the people in your life, bucko.
Right. Most of the things that are really concerning people are macro. Glass ceilings, police killings of black people, women dying due to abortion bans, assaults on trans people. Not everything can be dismissed as a micro aggression.