This may seem that I'm over-thinking/worrying unnecessarily, but I'd value any advice.
My LO starts school in September, has been at nursery for years so is used to other children and from what I can see, has friends there (although will be going to a different school to friends we think).
We have friends with children a little bit older and on a number of occasions we've noticed them being goady (eg mocking him if upset, sharing with others but not with him (& making this obvious), ganging up against and generally being unpleasant. If we see/hear this going on, we intervene if it looks like it's escalating and he's getting upset (by challenging behaviours rather than telling them off, we try hard not to overstep the mark as they are not our children to tell off).
Now I know that this is part of life, but how can I help my LO deal with this kind of thing when we're not around? We do talk about any instances of potential bullying and how it's made him feel (mainly because we don't want him replicating it) and also good things for him to do/say if they do it again, although at the same time I don't want to dwell on it too much.
Any thoughts?