Defensitive, an adjective, is used to describe someone who is being both defensive, AND sensitive.
Anthony: I don't think this was your best work.
Charlotte: Well... you don't ever give me credit for what I do... and ...
Anthony: Char... don't be so defensitive... I'm just being honest.
A combination of the words defensive and sensitive. Used to describe someone who is very defensive and sensitive about a particular subject or person, usually for no reason. Commonly associated with people who overreact.
So what happened between you and Amanda?
Okay sorry, don't be so defensitive