Yes, asexuals CAN still have sex.
Yes aromantics CAN still be in a romantic relationship.
If I say I'm aroace and/because I don't want either of those things, your first reaction shouldn't be to tell me I can still have them. I understand that people CAN, but they can also choose not to. Let people have their own reasons for identifying with labels. If I don't want sex or romance because I'm aroace, I should be allowed to say that without people using sex/romance favorability to invalidate my identity. That's not helpful. I don't need to be told I CAN date when I just told someone why I can't.
If I make a point about how not being able to be in relationships or not being able to feel the things other people do makes me feel isolated, your first reaction shouldn't be "but you can though."
Sure, I could, but I'm sure both me and the other person involved would be miserable. Just because I sometimes wish I could doesn't mean you can use an identity I don't belong to as an excuse to invalidate me.
I am not sex-favorable. I am not romance-favorable. This was not my choice. I have accepted that I will never be in a romantic or sexual relationship. But some people like me haven't. And we need to stop collectively treating them like they can just become sex/romance-favorable if they try hard enough.
Another thing is how my identity is pitted against those who are favorable. It's really sad, because it's not my fault some people use me to invalidate them, and it's not their fault people use them to invalidate me, and we need to stop pretending like it is.
I think a lot of the aro/ace community's problems would be solved if we jist treated sex and romance like they were just another thing people do sometimes. You can have them, but they shouldn't be EVERYWHERE and you should be able to avoid them if you want. Like yes, you can have sex/romance and engage with material like that, because it's just a thing people do sometimes. And yes, you can block one or two tags and not have to see that stuff, because for YOU, it's gross and uninviting, but it's just a thing people do sometimes.
Anyway, this was my somewhat long and nonsensical rant, sorry.