Two sides to Mikey
 

Has anyone else noticed that Mikey either seems to go from being very quiet to incredibly loud and rude.Is there no inbetween with Mikey?

Probably very difficult to judge other people's mood and reaction as he can't read the body language and gestures that others will - this may usually help determine how we behave, it's very difficult for Mikey so he probably merely acts how he feels and not let himself be influenced too much by other's reactions.

I think he does in the diary room he goes overboard lol

Me too, I think reading body language is a major factor in being able to interact in consistant tone when communicating with other people espeicially in a large group.