Antagonizing?

So, last night as I was finishing up some stuff for our homeschool co-op my eldest son (will be 5 in Sept) was sitting at my feet playing with some toys. I hear him say:

"Tommy, you must sit over here so you don't antagonize the others."

This boys concerns me at times. This is not the first time he has used a word that I consider over the head of a child his age. And he uses it correctly! And he pronounces it perfectly!

I'm a little worried that this child is a little too smart and my husband and I are in for some trouble in the future!