OK so brief outline is
Me and OH are married, and I have one son from a previous relationship. My son is 12 and has Asperger's.
SIL has 1 small child
Christmas 2019 my son was given a token gift from SIL.
Son whispered 'Thankyou'. (he is bad with social stuff at times).
After this, SIL attitude seemed to change towards my son, she stopped even sending him a Christmas card, or acknowledging his existence - and it did occur to me odd, but she had a baby in that time, so it never occurred to me there was an actual issue
Forward to a couple of months ago, and Hubby tells me that SIL was recently complaining to him about this Christmas gift and said that Son did not thank her properly...i.e why can he not say thank you like a NORMAL fucking person ie do not whisper, say it loud enough for the whole household to hear, and she doesn't feel Son is grateful enough for the five pound gift, therefore she will not be acknowledging his existence with even a Christmas card going forwards.......and she hasn't.
After this, Hubby is barely speaking to his Sister as they had words, he is disgusted. And I will definitely be saying something to her myself - even though Hubby thinks this is a bad idea
To me this is abhorrent behaviour and it appears she was just looking for an excuse to start some beef, over her self important attitude and her shithouse fiver gift i could ram up her arse
AIBU to say something, myself?
Fuming