The only thing that is in question here is the "prominent long boarder". He is either taking the piss out of you or is trying to impart his own rules onto you.
There are too many so-called "champs" who think they are way more important than they actually are. No matter what you ride you deserve a place in the surf.
Safety and politeness are the ingredients for an enjoyable time in the water.
Next time maybe you politely inform him that he is a wanker.
ET.