Ozzy does seem "mean" a lot and is not afraid to use his "power" in any way he sees fit when he wants to. He also has no qualms about telling peeps off.
However, there are lots of peeps who get "mean" when tired or tired of listening to crap, he has every right to be. you have no rights to try to control his personality type. I have found that some of my best freinds have that sort of personality and they are the ones i would (and have on several occasions) trust with my life because i know they will watch my back and use their personality to benifit me when its crunch time.
he was given admin by part for a reason, he does the job. If you dont like how he does it, go elswhere. its parts server, he can do as he wishes.
about telling peeps off, refer to my rant about personality types, he has every right to do it just as you do. if you arent good enough with words to make a convincing argument dont blame it on him. not many of us have been able to outtalk him and i am sure its frustrating to those of you who cant.
get over it, it will be ok.