Good reasons to get mad at a vegan:
-they implied everyone can/should be vegan, ignoring issues of poverty & health that make it impractical or impossible for many people
-they tried to make you feel bad about eating something
-they believe that the current animal abuse/environmental contamination/health crisis is caused by individual consumers rather than the manipulative capitalism of the meat and dairy industries
-they support PETA (eww peta)
Bad reasons to get mad at a vegan:
-they asked you about the ingredients of a food to find out if they can eat it
-they asked if your group could go to a restaurant with a vegan option
-you asked them to explain why they are vegan and they answered
–they got mad when you made fun of their diet