Would you be upset if someone called your son 'short king'

I have one son. He's 22 and it's really just always been me and him because his dad is a POS. He's short. 5'4 to be exact. He was helping me at Walmart find the right oil for my car at one of associates he's talking to is a girl. She was clearly flirting with him which is completely inappropriate if you're a store associate. They were talking about a TV show they both watch and she said "Ha. Okay short king!" I didn't like that. I think that's so weird and inappropriate to customer. They exchanged social media. I made a review on Google because Walmart needs to know the type of people they're employing!