chronipedia:

Aros/aces are not half, almost, or basically straight. Asexual people are not straight. Aromantic people are not straight. Whatever they might identify further with, they are not straight by default.

Aros/aces may choose to individually identify as straight but that is their decision and applies to them only. It does not speak for other aros/aces. However the situation, it never falls in the hands of allos to make that call for us and erase an important part of our orientation.