(I am asking on behalf of my partner as she was the one yelling - and she asked me to ask here - but for all intents and purposes to keep it simple assume it was me)

  
As i look out the lounge room window today i see a large caravan parked at the party house a couple of doors down. Don't have a problem with that as such. Then this afternoon i looked out the front door as my daughter typically likes to read on the outdoor setting on the veranda. Two kids being watched by their mum was playing ball in the cul de sac and my daughter was sitting on a chair watching them at the end of the driveway. I go in and tell my partner to go have a look at what is going on. He says he sees her at the end of the drive way and doesn't see the big deal. 

So I yell out at the mother "Are you embarrassed to be seen with a disabled kid or something?" The mother was gobsmacked. Our daughter picked up the chair and brought it back to the front porch saying she would just read a book there instead.  

Still no word from the mum as I yelled  "It's just cerebral palsy, she isn't poisonous or anything", to which she storms off into the caravan slamming the door behind her. My daughter followed me inside then goes back outside where kids are playing and this time they included her. My partner thinks I overreacted by yelling.

AITA?