If anything it means he thinks of you in a positive way. Some guys are naturally funny, and they often like to tease the opposite sex. Is he making sure you in particular laugh, or is he trying to get a crowd to laugh? Is he playfully teasing or is he being mean? It's easier to tell if someone likes you by looking at the specifics, time of day, and how consistent they do these things. And consistency is king when it comes to flirting.