I've namechanged.
Briefly - a relative has an acquaintance who is assistant SENCO.
In text exchanges with my relative this member of staff makes numerous negative comments about certain of the young people, and names them, as well as calling them names in the texts. Relative read a couple of the texts to me.
I won't elaborate further but in my opinion this is not ok and If I were the parent of one of these young people I'd be beyond furious.
I think it should be brought to the school's attention but relative is not so sure/would rather just leave it and not have further contact with the staff member. It's not my decision to make but I'm pretty sure this person has breached confidentiality/data protection rules at the very least.