I feel that he could use some coaching. If you are trying to have any kind of good relationship with someone who has a disability, you want to seek to understand, support, and empower them, with a much different approach...saying something like "that sounds like it must be a challenge having ASD, I admit that I really don't know what that's like, but I'd like to hear more about it..." etc. Later on when he knows you better, maybe he can offer more tips like "I believe you can do this despite your ASD" but it's not his place to just jump to conclusions early on like that...because even knowing ASD in general is not knowing you as a person with ASD, and like you said, if he knows ASD at all, he knows that it's a big spectrum and each person with autism is an individual...so clearly he's not a good person for you to be trying to talk to. The world is full of people who aren't good for us, as it turns out...