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Heterosexual and heteronormative are not the same thing, and I think it's important for people to remember the difference between them.
To clarify, for anyone unsure, heteronormativity is the assertion that being straight and cis are defaults and everyone who doesn't fit that description is a deviation from "normal".
On the other hand, various queer identified people (such as bi, trans, and ace), can be in heterosexual relationships but this does not erase their identity.
And even for cishet people in straight relationships, it's not necessary to be heteronormative.
Also, side note, queer identified people are not immune to heteronormativity. It's often behind biphobia, aphobia, and transphobia. Call it out.