5 barred in autism bully row.
The 17-year-old victim was teased in class while the lads filmed his reaction on a camera phone.
The boy shouts out in pain when a student flicks his ear and defiantly tells the gang: "You're not happy slapping me."
In one clip, the gang force him to read out a written apology.
When he later walks away from the abuse, one student shouts: "Where's the retard going?"
Film of the bullying at Bournemouth and Poole College in Dorset has now been removed from You Tube's comedy area.
Helen Owen, of autism group ASUR, said: "The clips disgusted me."
The bully boys, aged 17 and 18, could be permanently banned. The college said: "We will not tolerate anti-social activity."