I'll speak on this topic here as someone who is a heteroromantic ace. And I believe it's a choice whether het aces, aro aces, or het aros identify as lgbt+ or not, or straight or not in the cases of het aces and het aros.
I will first acknowledge that I strongly support the community and will stand up my friends and siblings who are queer in some way. They have also been very supportive of my sexuality despite it being different than their own experience, more so than most straight people I have known.
Personally, I do not consider myself to be lgbt+ just because that term heavily implies same gender sexual or romantic attraction and/or gender not being the one assigned at birth. I also don't consider myself to be straight because that term heavily implies heterosexuality.
I respect people who feel differently about and they ought to respect this about me. I do have different experiences than straight people and don't have full privilege there, but I just don't experience oppression and discrimination that people who are lesbian, gay, bi, pan, trans, or enby people do.