YANBu
People even get in there in advance with their wee digs in threads, before SN has ever been mentioned:
"the SN brigade will be along in a minute to derail thread"
"Someone will soon come along and mention SN"
"On MN there aren't such a thing as naughty kids but you always have to mention SN"
"Not everything is about SN"
"Here we go again"
People often say 'but we aren't talking about children with SN" as if parents of kids with SN have no right to contribute to the discussion.
I often get the "you always talk about SN" ..I have one child,,with SN. I can see why bishop, whose children also all have SN, doesn't feel welcome here.
I get told I am 'twisting things to fit my own agenda about SN", when generally I am discussing my one child who has SN, and therefore my total experience of children.
People regularly argue against inclusion unless people with SN can fit in with standard behaviour rules. When told some people can't conform we are told 'their rights don't trump other people's"
MN can be a grim place for parents of kids with SN.
As pag said, it is heartening when people speak up in support. But not a lot do. I don't blame them, I CbA with the threads these days either.
Totally avoided the thread about accessible toilets.,knew how it would go when posters immediately started saying 'I use the disabled toilet..this will kick off haha" etc.
For all these reasons, MN can be very "othering"
Even the shitty responses to the OP and lack of willingness to listen to her is part of this.
Definitely YANBU.