Don't expect eye contact. Their lack of eye contact has nothing to do with disrespect, but it has everything to do with their Aspergers. Use probing questions to make sure they understand what is expected of them instead of using eye contact as an indicator in their Aspergers education.
Every child is different from others. Parents should take the time to get to know their children with Aspergers so they understand how they think and operate. Do not put them in a category with your other children or educational failures will occur.