I haven't read the thread op, but I thought you might like a different perspective.
Firstly, very few people in this world are actually not good looking enough to be described as hideous. Most people are somewhere along the continuum of fanciable to some, but not others.
Secondly, it's very unusual to date someone who doesn't find you attractive.
However, sometimes words expressing as such are said. As many have indicated previously, it could be said in jest.
I did have a bf who said something along the same lines and it messed with my head. I now know he was doing something called negging- putting me down to make me more controllable and desperate.
My bf said, "No one can see why I am with you because you are not beautiful."
I won't go into details, but it was a toxic relationship that really messed with my self esteem. It was also bollox, I am not so ugly that I deserved that comment, like everyone I am pretty to some, not all.
Anyway, the reason I mention it is because this bf liked the idea of me, particularly because I was a virgin when we met, once he got to know me and my human side he couldn't handle it and became increasingly cruel.
The signs were all there in the beginning though.
The reason I give you my experience is because you need to question his motives and your understanding of him. If he's a genuinely nice bloke who's attracted to you, the remarks were obviously in jest and you should not give them a second thought, but perhaps let him know why you felt like you did.
However, if you feel he was not a nice person and put you down deliberately, then you need to cut ties and not give it a second thought.
In both scenarios you need to accept that what he said has no basis in reality. He was either joking or being deliberately mean. Either way, try not to let it affect your self esteem. I know it's hard, it took a decade for me to undo the damage my ex did, but I now realise it was his problem, not mine.
I know your autism will not help so I'd recommend talking it over with a friend you can trust. But do make sure it is a true friend, as in my case I confided in someone who made it worse.
But I can tell you absolutely that you are not hideous. People generally use that word as a joke or if you have an extreme medical deformity. (And in the case of the second scenario, they'd still never tell you to your face)
Honestly, you must be attractive enough if someone wants a relationship with you. Believe. In. Yourself.