I meant it specifically in case of aromantic and asexual for reasons I stated.
They meant that's the same logic used against queer kids, and that it's hypocritical to use it on asexuals.
Not really, cause the two concepts are very, very different. Asking someone who claims to be Asexual "Are you sure? Couldn't you just have not found the one?" is different from asking the same question to someone who claims to be Homosexual because the very different scopes of the notions. When you claim to be homosexual you're basically saying "I have a sexual interest in my own gender that I just don't have for the other gender", hence saying you still have a sexual interest but not in the half of the population you - for a lack of better words - are "supposed" to. When you say you're Asexual you're saying "I don't have a sexual interest in either gender" which of course is a much larger notion since it just removes the very notion of sexuality whatsoever.
The big difference is that is that only one of the two can be proven true as opposed to not false: "I have yet to find someone of the other gender I find really hot and who I find myself sexually attracted to the same way my friends do, and more importantly there is someone of my own gender who I find myself to have the same kind of feeling towards. I must be homosexual!" You can prove the notion that so far you have yet to find anyone of the other gender who you find attractive and you can prove the notion that you find people of your own gender attractive. Questioning it is basically saying "You're wrong!"
You can't argue Asexuality the same way since it lacks the second part, proving yourself right. It is easy to prove them wrong: "I have yet to find anyone I find sexually attractive." Boom, their notion about you being sexual isn't necessarily true! But there is still an arguably very valid notion that you just have yet to find the right one, since you can't prove it isn't so. You can't point to something specific and say "This is why I am asexual!", the best you can do is point to something and say "This is why I'm not sexual".
The two sound very similar but in nature are very different since it is easier to prove something wrong than proving something right. If you've found someone of your gender you find attractive you can prove yourself right in Homosexuality, but if you have yet to find anyone attractive you can only prove yourself wrong in Sexuality.
Further you can make an argument that the questions are asked for different reasons. Questioning Homosexuality usually stems from claiming it to be wrong. "You SHOULDN'T feel these feelings towards someone of your own gender!"
Meanwhile questioning Asexuality usually doesn't stem from thinking it inherently wrong but just not understanding the very notion itself. "How can you not be sexual? Everyone is! Aren't they?"
Then again I will admit to not be well read on the latter question so I won't really delve any further into it.
Even further however you can make the argument that the hypocrisy lies not in questioning if Asexuals really are, but rather in not asking Homo- and Heterosexuals if they really are. I mean I consider myself heterosexual, but at the same time I know my only real proof is that I have yet to find anyone male who I do find sexually attractive. I mean I enjoy Futa well enough so... anything's possible, right?
Just asking the question and making someone set out to find an answer to it is enough. It is not about proving them wrong, it is about making them ask themselves the question again.