The NBA has certainly changed in the last few decades. While the fact that fights no longer break out on the court is generally a good thing, the art of playing physical has all but vanished.
In the playoff series between the Indiana Pacers and the Miami Heat, Larry Bird called his team "soft" after the Heat played a more aggressive game and seemed to dominate the Pacers physically. Being called out because you lost is a part of sports, but being called out for being soft is one of the biggest insults you can receive.
This list is a group of players that have earned the reputation of being called soft. One distinction that needs to be made is that just because someone flops does not make them soft. Players such as Manu Ginobili, Blake Griffin and LeBron James may flop to get calls, but they take a beating on the court and should not be considered soft.