Hmm, pardon, where is it we differ? The word "just" makes me think this is a correction, but I agree with all of that, and I feel like if you that if you take all of that to be true, you get the sentence of mine you've quoted.
I don’t see it as a strong disagreement, but there is a slight but sometimes important difference between heteronormativity including, e.g., cisnormativity and patriarchy, versus heteronormativity being distinct from them but frequently co-occurring with them.
But we certainly agree that heteronormativity is different than society having a majority heterosexual orientation.
For sure, I can see how I elided some concepts there; I think my definition was appropriate to the context of this conversation, but I appreciate you keeping me honest.