If another child, member of the family, aged 7 was being rude/mean with your child aged, 3.5?
My DD is no angel but she adores her older cousin. Her older cousin often completely ignores her attempts at communication or throws a toy on the floor if DD has tried to give it to her.
The cousin's mum does tell her off but it's ineffective really, as the behaviour has been going on quite a while and there are never actually any sanctions as such.
I use the naughty step if DD hits or does anything undesireable. As I said, she is not perfect but it's not nice to see her cousin being unkind to her.
For example, last week, at gathering DD wanted to sit next to cousin, and cousin pulled face and said she didn't want DD there.
WWYD?
Might not be back staright away but interested to hear your thoughts.