He wasn't being very nice, but it could have been avoided if you told him what a clan was and explained rationally that he couldn't come in now, but maybe another time. And if he continued just /ignore. He shouldn't have been rude, but you really shouldn't have been provoking him. Patience if a virtue, friend. :o
<3
Offtopic: You truly deserve the title "too nice"
Ontopic: Magick is right you could have just explained instead of provoking even if this guy wasn't the brightest bulb in the shop.