Ah that's tricky if the mum's pushy. Maybe say something vague like 'I have so many weekend commitments it's just not a possibility right now'.I’m hoping I can just get out of this one indefinitely honestly if it was any other kid I’d be up for it but my daughter and him are just bad for each other and he’s unfortunately (probably through no fault of his own) a badly behaved child.
I've been there with one child's friend who would purposely mess up the bedroom/be openly rude to me. What I would do if my child really wanted a play date is collect them from school, hour at the park, whiz them through the drive through and drop him home. I struggled with the people pleasing too but honestly it's so liberating doing things on your own terms.