I don't see whats the ranting all about...

Look carefully, this thread wasn't created by a united fan, moreover he has every right to post what he likes just like you have every right to ignore whatever you don't like. And FYI, you can find a similar topic on this at Sports as well as Man utd forums. But i don't see you kicking up a big fuss over there... What used said was very right, he was only trying to reason with you, there was no need to go on a rampage like you have. And if you care to look carefully, they were started by different individual. People who have their right to post just like you.
I guess its understandable that you being a pool fan and a very anti-utd one is feeling sick with the thought that Man utd have won the title. Fans celebrating winning the EPL title is very normal as the premiership is fought over 9 months... People tend to be happier as it was hard earn therefore going on for a few days is perfectly normal although i can understand that the sight of it can be very undesirable to you but lets not forget that there are others who don't share your sentiments.
Lastly, you should remember one very important thing, and that is, whatever you don't like to see or read, you can choose to ignore but you should not try to dictate what others should do.