sneezing

cold and flu time will soon be upon us,(if it isn't already)so that means it's the season for sneezin'.
so when someone sneezes,do you say God bless you or gesundheit? if someone says "God bless you" & you don't like it, do you say something? do you go on a rant about it? should you say anything about you feelings?
it's my humble opinion that you shouldn't. if you don't like that for whatever reason, just smile politely and say thank you. you don't even have to smile, hell you don't even have to say thank you. sure the person will think you're a rude jerk, but that's better than them thinking that you're nuts.