They can say whatever the hell they want; what do we care?
A Judo club uses the mats before we do; it's owned and operated by Wayne Erdman; 6th Dan. (Former coach, Candadian Olympic team.) Every one of them - and it's a big class - is respectful, friendly and mature in regards to other disciplines.
So; I don't give two pins what the children on that other forum say or think; it's entirely their loss in my experience. As for going onto that forum; it's an exercise in futility; I for one have no interest in getting into a wah-wah argument with these kids; it isn't one you can win. Let them step onto my mats, I'll answer that way.