I cannot stand when people assume if I'm not in one group, I'm in the opposite group...
"You aren't a Republican? Then you must be a Democrat!"
"You're against hunting for sport? Then you must be a hippee vegiterian!"
"You don't like capitalism? Then you must approve of communism!"
Do people ever do this to you? It's done to me all the time and it bugs the crap out of me.