Maybe the crab was just cutting him off for taking a vertical video.

Crabs are not good drunks. They already can't walk straight, and they constantly wave their hands around like they want to fight. What's worse, they're grabby, and there's no telling a drunk crab to let go of something. That's what happened to this guy, whose beer bottle was absconded with by a sand-colored crustacean with an attitude problem.

Then, in the ultimate jerk move, the crab just drops the bottle and acts like he has no memory of any of that even happening. And you can't even stay mad at him, because it's his beach and he's letting us humans use it.