Joel tudor has incredibly bad manners and is well known for being a snake and drop-in artist. The reason he got into martial arts was because he kept getting beaten up for it, especially in hawaii. Now he drops in on everyone but can also back it up and fight on the beach
This might be contentious, but I reckon 90% of 'really good' surfers are snakes and drop-in artists. In today's crowded line-ups if you want a lot of waves you have to snake, and if you are going to get really good you have to have a lot of waves and have a competitive mindset.
Certainly the few times I've been abroad surfing and there have been big names in the water they've not been the politest.