Completely agree.
I too sadly had to call time on a friendship. A very hard decision. Due to her kids being spoilt, obnoxious, rude and poorly behaved. I'd have worked with her if she'd have admitted they could be problematic, but she literally couldn't or wouldn't see it . The final straw was when she started to use other child (including mine ) as convenient scapegoats when there was any mishaps that her children had caused. I feel sorry for her as I've met a few women along the way who've had very fleeting friendships with her, then the same pattern emerges and they make a polite exit. It's sad.
But the short version is : they had no boundaries, no discipline and mum was terrified of the word "no".
Schools have now become SEN institutions with the handful of neuro typical kids being ignored and expected to accommodate. Teachers have become pathetic (through no fault of their own really ) pussy footing around, accomodating 101 different SEN's and telling off neuro typical children for behaving normally around them. Madness.
And "coz of SEND" is the latest excuse by parents that can't be arsed to parent. I think people actually forget what SEND and SEN actually stand for. It now seems to be used as a label "my kid is SEND" which has become synonymous (unfairly) with "badly behaved".