Teacher Rich is a man. Therefore, he cannot understand women.
Ad hominem
Everyone loves Tr. Rich, so he must be the best teacher.
Appeal to the Bandwagon
No real math teacher ever played golf.
No True Scotsman
Teacher Rich is a male math teacher. It isn't right for all math teachers to be male.
Straw Man
You: "Teacher Rich, the pythagorean theorem is wrong." Tr. Rich "How about those Eagles?"
Red Herring
Teacher Rich is a vegetarian because he doesn't eat meat.
Circular Reasoning
Teacher Vinh isn't a vegetarian, therefore Tr. Rich must eat meat too!
Guilt by Association
Teacher Rich goes on vacation at Martha's Vineyard. Therefore, all math teachers go to Massachusetts for vacation.
Hasty Generalization
Teacher Rich wears a math T shirt. Therefore he will get too cold, have to go home early from work and the whole day will be ruined.
Slippery Slope