A guy who behaves like a little bitch in so many situations, he can be generalized as "little bitch guy." Little bitch guy is not to be confused with "acts like a little bitch when he's with his girlfriend guy" because he's a little bitch regardless of his company.
A: "Dude I think I'm only going to do one set of pull ups today, I don't want to get a callus on my hands."
B: "Whatever you say little bitch guy"
A: (after friend jumps over fence to save some time getting to the bball courts) "Think I'll walk around man, that looks too hard and I don't want to hurt myself"
B: "Alright little bitch guy, I'll see you on the court."