I know not everybody gets on with everybody else but :
arrogant and patrionising towards the students
I think not!! Do you have another CGI?? Being a current CCAT student and having just finished a block of ground school I have found all of the instructors to be top-notch, the CGI is one of the best.
However, whatever you may think, I am not sure that an anonymous forum is the place to make your views known, why not have the courage of your convictions and talk to the management or god forbid the CGI himself as others have suggested, I cant see how sounding off here helps your situation in any way.