What do you think?Should I say something?

Should I say something in this situation? Went out with two other families to play. Another kid also came. He is another friend's child but his parents didn't come. He's a year older than my son and grew up in China. He just came to America two years ago.  He was so bossy today and called my son stupid said other mean things. At the end he even said to my son,"your house is messy" I got really mad when I heard this. I tried really hard not to say things back to him since he's a child. But I am still upset until now and wish I had said something to him back then. I've been nice to his parents and even bought a really nice gift for his birthday. Other times I gave him rides while his dad left my son at home when it was his turn to drive him to a game.  His parents are kind of snobbish.  And we aren't too close.  Now I keep on maybe his parents were not saying good things about us at home to their kid.  My son is very smart but innocent. He's very kind.  I hate to see him being bullied like that.  What do you think? What would you do in this case? Thanks