It's not a dick move for him to try and get coupons despite having people behind him and having the birth defect. Perhaps a bit selfish, but he's within his rights to do so.
It's also not ableism to be annoyed if someone is taking a shit ton of time when it's cold outside.
It is, however, "ableist" or whatever the word is, to feel like you can't be annoyed at a person's behavior just because he has some kind of defect. Think about complimentary racism. It's still racism, even if you mean for it to be a compliment or associate some weird positive trait to a person simply because of race.