What does it mean to be a pushover and what does it mean to be kind?

If someone is a pushover they will be pushed around. When they get asked to do things they do what they are told. They get taken advantage of. Like when Stradlater asked Holden to do his english homework, Holden actually does it. Then Stradlater got mad that it was on a baseball glove. Stradlater was not even happy that Holden did it. Stradlater didn't even say thank you for it. Holden is a pushover because he gets pushed around and doesn't even get anything out of it.
A kind person is someone who cares about other people's feelings. They like to help people out. It is like when Holden asked Ackley to go to the movies but they ended up just playing video games. when you are kind you aren't a pushover you are just generally a nice person.