AITAH for telling my husband he sounds entitled?

My husband started his own tech business a year and a half ago. We live in a semi-rural area and needless to say it is not an easy pursuit. I want him to succeed and get all the $$ he can, but there are times when he has come off to me as entitled when he comments on his "exclusion" from certain events.

We were watching TV tonight and he turned to me to show me a sign-up form for a networking event to connect with potential investors. The form asks if you are a CEO and part of an underrepresented group including POC, LGBT+, women, and veterans. If you are not part of those identities you can't fill out the form. He tells me that it seems like this event is "prejudiced" against him for being a straight white man.

Whichever way you feel about identity politics, I don't feel that his use of the word "prejudice" is correct here. It isn't an irrational belief that straight white men statistically do better as CEOs than other groups.

Even though I don't agree with his choice of words, I tell him that "maybe this event isnt for you" and he doesn't like that, insisting that there is some kind of prejudice against him. I respond that to me, that is a twisted way of looking at an event organized to help marginalized groups connect with funding for their business.

He now is saying that I'm "not on his side" and I "don't know what I'm talking about about" because this is specific to the business world, and I told him that he sounds entitled and there is plenty of space for him, so why get so bitter about an event trying to help other groups?

I am definitely on his side, but in this issue I feel his perspective is warped and our night is ruined by an argument. AITAH?