My ds 10 was subject accelerated 2 years in early grade school, math and reading. He enjoyed the freedom of switching classes every day (it was probably the side trip he would make to the library).
There were situations like this at times, and my son might have been close to the slowest. One situation I can remember, one of the boys used to touch my son (he hated that). Touch his snack or anything to get a rise out of him. When my son would retaliate the other kid would cry and say my son was doing the touching or hitting him. My ds got in trouble for arguing his situation several times.
We told him to tell the kid if he continued these thing he would not be his friend. My son went in the next day and told him. We were very proud of him taking this on. They were never close friends but the other kid stopped this behavior—or I should say, he found someone else to pester.
The positive, he ended up with a bunch of friends from all grades.
I hate these