Not sure about that. Plenty of neurotypical students talk that way at school and the kids lack social skills (social inhibitions) while picking up language from the adults and children around them.
I don’t believe they need to put an autistic kid in hand cuffs. He should have been barred from attending classes before this happened. Their are institutions that provide one-to-one care but it’s hard to find one that is properly run and staffed. No, the kid shouldn’t be allowed to physically attack anyone but I don’t see how traumatizing with a “scene” including hand cuffs would help. Some of these schools are good and some further traumatize because they are understaffed, ideologically run, or have bottem-of-the-barrel teaches poorly supervised. One such place produced a very large teenager said to be violatile and agressive. Move him out of that heck-house similar to “One Flew Over The Cuckoos Nest” and he is a sweet young man who responds well indeed to civil treatment. I don’t think we have enough info here but again - cuffs on a 10 year old with autism seems like misapplication of “the law.”
I worked as a classroom aide for awhile when my daughter was in school. I worked in a class that had ten and eleven yr old autistic boys. The ones who used that type of language had parents who used that type of language. They also were the most aggressive to everyone. Parents were often single mothers ho did not want to follow any suggestions about schedule or structure.