What gets me is that DEI is a vital, even critical, part of any company which purports to be invested in making software which is suited to a wide variety of users. When you have a homogeneous set of software writers, you're not going to get a wide variety of inputs -- and your output is going to be likewise constrained. (And that's putting aside the implicit biases found in, say, LLMs.)
What Microsoft are saying now is thus the racist and sexist equivalent to every abled manager dismissing the concerns of a disabled employee -- "It works for me, so it must be a you problem."