I think when they're attacking/upsetting someone else (as here) you do usually have to step in to make it clear it's not acceptable but that doesn't necessarily mean arguing, you can just say "Stop this discussion right now" and freeze the thread etc.
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I think when they're attacking/upsetting someone else (as here) you do usually have to step in to make it clear it's not acceptable but that doesn't necessarily mean arguing, you can just say "Stop this discussion right now" and freeze the thread etc.