There's a lot of misconceptions about asexuality, so it's not uncommon for someone to say "oh you're probably just asexual" when someone says they don't like sex, or don't want a relationship.
The only requisite for being asexual is not experiencing sexual attraction. That is it. If you don't experience sexual attraction to anyone then you're probably asexual, or at least on the ace spectrum.
noeffing if you experience sexual attraction and choose not to have sex for whatever reason, you are not asexual. Asexuality is an orientation, not a choice. Also it's incredibly rude to refer to things as "snowflakery bollocks" just because your personal experience is different from other people's. It is perfectly possible to debate without calling people names or shitting all over their experience.
Captain It varies? I haven't been, but asexual people have varying levels of libido and levels of arousal, that is to do with biological processes (hormone levels and other stuff) rather than just sexuality. There are straight and gay people who have a lot of sex, or not a lot of sex. Or who struggle with arousal or don't.
I would imagine it's easier for a female to have sex without arousal than for a male, although there are obviously pharmaceutical methods to make things easier (that's probably the wrong word) if you need to have sex (for procreation for example). Ideally I'd like to never have sex, I plan on procreating using artifical methods of insemination, but that's also cause I plan on being in a relationship with a woman, if I ended up with a man sex would be the easiest way to have children so I'd just deal with that. There are some asexual people who would never be comfortable with that.
Material Romantic attraction is wanting the stuff in a long-term romantic relationship (without the sex) with someone. Strong loving feelings, maybe wanting cohabitation, maybe raising children together, maybe just viewing that person as 'more important' than a very good friend. But that's just my own experience, I'm sure there are other asexual people who experience romantic attraction who can add to that. It's more than just platonic feelings, and can also have a level of intimacy (cuddling, sometimes kissing, caring for the other person etc...) that would be unusual in a friendship by current societal definitions of 'friendship'.