Domincan Republic

So, during the summer, I went on vacation to the Dominican Republic. One day I was in the pool, and one of the Dominicans started speaking Spanish really fast. He was about 17 or 18. I gave him a confused look, and in English he asked, "Do you speak spanish?" and I said I know a little bit. He asked if I was American, and I said yes. So, for some reason he smiled and was like, "What's up bro?" and I said not much and that was pretty much the end of our conversation. It was quite wierd.