a couple days ago I was walking towards the lobby and this guy yells Buenas tardes which means good evening I didnt know he was talking to me so I said oh are you talking to me and he said yes and started laughing. Abit later I went into the kitchen again and he yells Buenas tardes but since it was late he corrected himself and yelled Buenas noches which means good night. I thought he was being friendly but today in the morning when I went back to work he yelled good evening again and smiled. Is he mocking me/playing games or just plain out being friendly/flirting? Im super shy and it makes me feel self conscious