Revolting and vile behaviour by these boys. Nothing "bantz" about it.
However: I am seeing this through a very long lens, OP, through which Year 9 children seem very young.
With that in mind:
- What is your son's school's policy on bullying/complaints? You need to follow this to the letter.
My DC's schools all had very clear bullying/complaints procedures. Normally form tutor, then Head of Year, then Head. You get the best results from schools if you follow the procedure. But make it clear that you want immediate action (not woolly words), otherwise you will escalate it.
- Give them a couple of days to work out how to discipline the offenders. They need to explain to you in writing what they are doing.
- If you are not satisfied, you then take it to the next staff member in the food chain (I only know how this works at my DC's former schools; yours may be different, so I won't make suggestions which might not be relevant).
- If the next staff member doesn't come up with anything satisfactory, escalate again. This takes patience, but will bear fruit.
- I completely disagree with those saying "go to the Police". It's all very well saying that, but the police really have got far too much to deal with, and this would just be a box-ticking exercise for them. What you actually want is for your son not to be on the receiving end of vile racism. That is what actually matters. School is the only way to achieve this.
As for how the boys' parents would feel: I don't know, is the answer. My DD was on the receiving end of some unspeakably vile mysogynistic bullying when she was at school. One of the perpetrators was a "lovely boy" whom we had known since he was a toddler. His mum was absolutely horrified when the school told her. I found it almost equally hard to believe.
But then there is peer pressure, and hormones, and all sorts of teenage stuff swirling around. Sometimes perfectly nice children are capable of appalling things, especially when they get together. This absolutely doesn't mean that 'boys will be boys' or any such shit. It's just that from my 'now' perspective, Year 9 now seems like a year when children are developing, are desperate to conform, say and do really, really vile things just to be part of a group - when they would never say or do these things on their own.
Of course, the children you are talking about could simply be very, very badly brought up and have already been set on a very sad course which means they will have very unhappy and disjointed adult lives.
Whatever the case, I really would counsel that you approach the school first.
As for whoever it was that said they called their six-year old "Bully" for several days: this makes me feel quite sick.