Dwight's a cry baby.

We realize exactly who Dwight is once they start to hang around him more especially at the turkey shoot when he tell Jack he can't actually shoot. His mom when he entered the shoot won and made Dwight look really bad and he through a fit making himself look even worse one for lying to Jack and  two losing to his girlfriend. When they all got back to the house he went to his room and continued his fit until he came out and decided to act human. This made Jack like him less I don't blame him.