I'm grossed out by the whole concept of 20-somethings labeling themselves "incels" because they can't seem to interest the opposite sex. I look around and see some really sad examples of human beings of all types -- lazy, temperamental, criminal, unintelligent, uninspired, i could go on for days -- managing to find a mate and settle down. I just want to shake the incels by the collar and show them these people. "Just adjust your expectations downward, and maybe you'll get lucky and someone else will too."
As for asexual, he may have self-identified as such, but clearly he didn't understand the meaning of the term. One of my asexual friends has described it to me as having zero interest in "down there" activities. Another described as zero interest in cultivating romantic relationships at all. I used to think of all of them as broken, but I let that thought go. The world is big and has room for lots of varieties of human experience. The last thing I'm going to spend my time worrying about is why another person has no interest in sex or romance.