Umm...in the picture you showed the beer is clearly in the hand of the fan. How is it possible for that beer to get hit sitting on a surface, jump into the fans hand and spill right onto the player?
The replays I saw clearly showed the fan tossing his cup - whether intentional or not - he did spill his beer on him. IMO it was intentional.
Sheffield knocked the guy/beer when he was going for the other guy, thus the beer spilled. I guess we can just agree to disagree. But I ask you again, find a news article saying a beer was intentionally spilled on Sheffield. You can't and you won't.