DS is 3.5, DD is 1.5. Often we go for lunch at a great local cafe run by a charity that provides training for adults with special needs. In addition they often have customers who have special needs. Its a lovely place with nice food and great for kids - e.g. kind staff, toys, don't care if you spill your drink/ shout about Power Rangers v loudly.
However sometimes the customers with SN attract my kids attention - for example today there was a woman who was constantly groaning, staring into space, wearing a helmet to protect her head and needed to be fed by an adult helper.
My DS in particular has started to notice that this behaviour is different to the way that other adults behave.
I don't want to offend anyone and want my kids to be open minded about all people in society - how should I explain it to him?
Your help would be much appreciated.