Here’s the thing.
If you lived in a society where you were treated as a second class citizen because you had green eyes, I would absolutely be in favor of you having a “Green Eyes Pride Day” to say to the world “Hell, no, I will not be ashamed for what I am, nor will I allow you to treat me poorly simply because of my eye color. I am proud of who I am.”
So if there was ever a time where whites (or men, or Christians) were being constantly discriminated against in our society, I would then say it would be fine to have a “White Pride” day.
But if you’re the ones doing the discrimination, you have nothing to be proud of.