Watch It, Buddy

Last Friday, a certain son of mine and I were having a conversation about smart phones.
This child wants to upgrade to the world of smart phones, but doesn't want to pay the difference. He was making a list of all the reasons he should have this device - some of which were starting to sound reasonable to me - but then he made a fatal mistake. He said, "Besides, 95% of the people in the world have smart phones now. And the other 5% are old ladies."
I am among the 5% with a basic phone (Not sure that's the real number. My son likes to pull percentages out of the air when he's trying to make a point.) so I chuckled and said, "Watch it, buddy."
He just huffed and said, "What?!"
And I asked, "Are you calling me an old lady?"
Let's just say, his response did not win him any points with me. *wink*