Well she is more of an acquaintance - we met at a surestart group.
We met her by chance at the park this afternoon and this evening she has ffelt the need to email me to tell me that my sons behaviour is unacceptable and should be looked at, and that I shouldnt take him out if I cannot control him :( 
Her DD is a little older than DS2 and she kept getting in his face which is his major pet hate. He gritted his teeth and said the phrase that he always says when people get in his space (something he has copied from Ben and Holly) - he didnt hit her, didnt touch her and when she backed off he went off quite happily. He is only 3.8 so just a baby really even without the ASD (which 'friend' is aware of).
Its not a friendship I will miss, but what she has said really hurts.