DS is just shy of 3. He goes to a private, large "outstanding" nursery. He is a sensitive boy, a bit shy with new people, but v verbal/explains himself well.
A few months ago, there was an incident whereby there was a floater teacher (Teacher S) whom he didn't know working in his room. he was tugging himself (wanting to go to the toilet, was recently potty trained at that time). instead of taking him to the toilets, teacher S had a big scream at him in front of the other children and made him feel utterly ashamed and awful about himself. He was very tearful for ages and took other staff a long time to settle him that day. He regressed with his potty training for a good few weeks after that, intentionally wetting himself, wouldn't let us change/touch him etc. Directly related to that incident (he referred to it all the time).
I was told of the above incident by his key worker that day - she found him in a "terrible" state and reassured and sat with him etc for ages and comforted him. So none of the above were "assumed".
Following that incident I had stern words with the nursery head as well as teacher S in question. Teacher S denied any wrong doing. But apologized nonetheless. The head was v sympathetic, played down the incident but apologized also, had talks with all the staff etc.
Teacher S was also kept out of Ds's classroom for a while (not my request, maybe it was management action but maybe just coincident since S is a floater anyway). But now she has been working in his room from time to time again.
I found out tonight from my DS that she was singing songs with the children in circle time and only excluded my DS in her songs (didn't sing his name out but sang everyone else's). I feel sure this is not a mistake but very deliberate. I picked him up this afternoon and also saw her giving me dirty looks.
My concern is there will be continued off-hand, small, unfair handling of situations going forward by this teacher towards DS.
What would you do in this situation?