Ex-h is notoriously unorganised. Ds's school are breaking up a day early, when DS is with him. They notified us via email and someone also posted it on the whatsapp group for the class. Ex-h receives both of these.
I get a series of panicked and angry messages today blaming me for him not knowing about this. My response is that I can't help out as I'm at work (true) and that he needs to sort it out, as he had the information available but did nothing to it.
Is this correct, or AIBU? He has called me all sorts of names and told me I am a horrible person, and that I should have reminded him again.