Pool is 90% mental and the psychology of aggression is a factor in performance.
If a player who just won a game jumps to the table so quickly that the cue ball is still rolling as they place their cue on the table, then they are making a statement.
Any alpha player would notice this behavior and would be remiss if there was not some response. They may not make issue of it at the time of the occurrence but you can't allow your opponent to gain psychological momentum.
Calling the foul was simply an effort, within the rules, to prevent his opponent from holding the higher ground and put a damper on his enthusiasm.
It may seem petty to some but if you truly understand the psychological interplay of performance, you will see this situation as nothing more than a controlled response to an aggressive action.
There is no right or wrong here....it's just competition.
I guess this, among other reasons of course, is why I will never be a champion player. I simply cannot pull a dbag move like this. Yeah, I can sense when momentum shifts. I attribute it to either a mistake on my part, giving the opponent the opp to win, or great play on the opponents part. Being an ass to try to get that momentum back is not something I've considered. I focus on my play, and try to turn it around on the table.
I guess in the end, I'd rather be graceful in defeat then an ass with the win.
NOTE: I have a job, my livelihood does NOT depend on pool. I look at pool as a way to have fun in a competitive environment. I have met great people through pool, and would rather make friends at the pool hall than dbag a win...Obviously these guys are on a much different level and have much different objectives.