People started throwing the cups after security confiscated the snake. I heard that security said they were afraid that there was still beer in the cups and it would get on fans including kids.
Last time around fans carried the snake out of the stadium and left it on the road leading to Nats park. The defenders coach said he wanted to drink a beer after the game and add to the snake, so the team has embraced it. It was brought up at the fan event I attended a few weeks ago as well.
