As far as I can tell, the culture war is won by people that make the culture war "uncool".
There's an oft-told story about a kid who said he was trans to his Dad. Dad, who is apparently on the ball with shit, went full in with it and said, "So am I! Let's be trans together!" Sure enough , Dad started buying women's clothing and made a big scene about it whenever he and the kid were out in public anywhere. Sure enough, the kid decided he wasn't trans anymore.
Now, I've never been able to verify that particular story, but it seems there's an element of truth to it.
So...the way you stop DEI is not to combat it with your own identity, but claim to be non-binary AND something else equally unverifiable (like being a system or some of that preposterous shit), just make it so that you're even more "marginalized" than anyone else. That second part is very important because you need to be more marginalized to be an even bigger asshole than the DEI assholes. Get them spun up about you stealing their thunder. Change the power dynamic. If their power is the institutional power of claiming marginalization, then claim that power for yourself.