Please tell your DS my Dyslexic DDs mantra.
"Dyslexia does not mean stupid!"
It does, however, make making friends hard, in the simple pecking order of primary school you don't quite fit in.
Subconsciously DCs want to be friends with someone like them, DD isn't like them, she was the worst reader in the class and probably the best scientist, her comprehension skills are as good as any of them, and better than most, but she can't spell 'could'.
She doesn't fit in, she doesn't want to fit in and she can't fit in.
Just as she can't see the structure in words or learn her tables, she doesn't remember names or gossip, but most of all she doesn't pick up subtle social cues.
She mostly gave up trying by the end of reception, but as your DS says sometimes it hurts, sometimes it's impossible to understand why they kick you and hide your things.
Sometimes you want to be part of the gang,
I'm afraid I can't give your DS a magic cute I wish I could, DD finds her escape in singing, which she does well enough that even the bullies say well done, and strangely in books.
At 11 she finally learnt to read.
In Y5 she made friends with a geeky Dr who mad Y4 boy and she is great friends with two girls from guides.
School has got better, but it took until Y9/10, which is little comfort to a Y4.
All I can do is say that I bet there is something he's good at and someone to be friends with, but finding them can take a long time.