Hello Nigel,
I actually empathise with what you say here. My high school was also a blend of different cultures, and each “friendship group” would mainly consist of one or two same or similar cultures. We also got along quite well, and it was only when “skirmishes” got really heated that the cultural insults got thrown out into the open.
And that is what I like about your post. It is blunt and honest, and your anecdote adds to its credibility. Although for “formal” purposes, I usually refrain from swearing, and suggest to others not to swear, the swearing in your post adds a personality to the content, as well as makes it more relevant to readers. Maybe replace some of the letters with asterisks instead?
Thank you for sharing your anecdote.
Kindest regards,
Vanessa