Yes, heterosexual aromantic and heteromantic asexual people can never know what it is like to experience homophobia,

uh, no. i've been the victim of homophobia (along with my mother) more than once, even when i thought i was straight because i didn't know any better. i've been the victim of homophobia because someone else decided i fit the mold of a lesbian regardless of my actual sexuality.

anyone can be the victim of homophobia because it has very little to do with the victim and everything to do with the homophobe.