Question about B&M etiquette...

Just wondering what everyone's thoughts were on the following...

After winning a monster pot, do you wait a certain amount of time before cashing out?

This happened to me tonight, but I really did have to catch my train (already been there for 5 hrs), so i played maybe four more hands and left before having to pay the charge for the next half hour.

People sighed and made comments like "oh man, taking all the money off the table" ( i was chip leader after the monster pot). I know the guy that I took the monster pot from wasn't pleased.

So, did I do something wrong y leaving so soon?