Every MLB fanbase thinks ill of a rival player, either because he underachieved during a previous stint with the team or needlessly causes trouble.
Of course, it is often more complicated.
Upstanding citizens like Derek Jeter and Joe Mauer get jeered for exemplifying excellence in the front of those who lack it. Jealous spectators vocalize their discontent in the form of booing. Skipping town for higher pay also tends to rub fans the wrong way.
As you would expect, many of these hated individuals rank among baseball's best at their respective positions.