Maybe I'm just spoiled.
Growing up in the San Francisco Bay Area, I spent my childhood going to A's and Giants games, watching players like Barry Bonds, Mark McGwire, Jason Giambi, the Big Three (Mark Mulder, Tim Hudson, Barry Zito), and Kirk Rueter come and go.
The stadiums were packed, if frigid, and the fans were always good-natured as long as you weren't wearing anything blue.
Beautiful AT&T Park, on the shore of McCovey Cove and San Francisco Bay, has always been a popular destination, and for the most part, Giants fans have filled it with cheering fans full of energy for their Orange and Black heroes.
Sure, Giants fans boo the other team; everybody does that. But it takes a special kind of fan to boo their own players; maybe these fans are only in there when the weather's fair, or maybe they're so die-hard that they can't stand to see their players under-performing.
Sometimes it's not the players that are the target of the booing, but the management and front office that controls the team. The players, unfortunately, and front and center and targets for the hatred. Either way, the players hear about it.
Here are the teams that get the most hate thrown their way from their own fans.