Originally Posted by MomoPufflet

Has the "anime girls = pedo" stigma actually entered the mainstream or are people suggesting more that it was "40yo guy with cartoons = pedo"?

Women (and men) in anime often look quite child like because of the style, but all things considered it looks like they just thought his card was fake. That can happen with any nonstandard card. My wife has a Chase card with all the details on the back instead of the front, and she's had to explain it to a few people before they would accept it.