2000 seems like a large number, until you realize that you have to compare it to the mindbogglingly large number that is the surface area of the ocean. He may as well pissed in it for all the harm he did.
If this were a fad, you might have a point.
He had no meaningful effect.
Saying 2000 bottles is not a big deal in the grand scheme of things is shortsighted and irresponsible. Millions of tons of garbage doesn't appear in the ocean for no reason. It exists because everyone thinks to themselves "hey, the ocean is a really big place... what harm does a few bottles really have?" The problem is only getting worse, and after all.. we haven't had plastics for that long.
There's no justification for throwing plastic bottles in the ocean. It doesn't improve the environment in any way, but it currently negatively affects hundreds of species.