While I completely hear you about likening his disability and situation, this kid and my husband have the exact same disability. He secondly ha some mental issues but it's a need for attention and fawning. He's the guy whose on fb everyday talking about how his life is terrible and he's thinking about suicide because he's so alone and miserable.
The psychological issue is he has to be worse off than you. Have a headache? His is ten times worse. Bad day, you won't believe his! For example my oldest has been suffering from a pretty bad cold, couldn't get out of bed sick. One day while he was studying, she finally came out of her room to ask me a question. I asked how she was feeling and he calls or from the table behind where I was sitting to interrupt my child and complain of how he feels crappy. He wasn't even in the same"room" so to speak.
He does all this so he can seem like a martyr and hero to everyone else. He feels threatened by the fact that my husband succeeded better than he did and has it harder. It ruins the narrative when he tells us how amazing he is because his struggle to get through school. He always brags about how people are in aww of his perseverance.
I normally would never point out or compare my husband to someone else. You're absolutely right that some have it easier and some have it harder. I have been around this kid nearly as long as my husband and can absolutely tell you they have the same level of learning difficulties. I mean down to having the same conversation about issues with the concept. Difference is the attitude they take about it. Also, this isn't the first time I've heard this conversation. Everyone has it easier than him. Even the dislexic guy with the full time job and a family and no car has it harder than him. He told the guy in tutoring to get over it. I could have killed him.
I'm sorry about your friends though. It's really hard with disabilities. Biggest key I've seen is learning how to learn differently. Problem is that's pretty much impossible because no one knows how to help, and worse our education system doesn't like anyone doing anything different. Most of the world doesn't get how hard it all can be. One of the most literal examples i can think of is my husband and I in a trail. I said "look at the markings on that tree" pointing to the one literally right in from of us. My husband couldn't see it. Hell, he couldnt find the tree. Why? He was examining every tree behind that tree. When i put my hand on it, he literally walked up and put his hand on it, to lean around and look at all the other trees! And I hate it because his family likes to tell people(and him) he just has just no common sense. It just pisses me off.
If you ever need to rant, pm me. I completely get how hard it is to learn "outside the norm" and unfortunately it never gets easier. I'm really sorry you didn't have a sympathetic ear.