I'm not sure you should've refused to print the flyers.
Hear me out...I get that TP USA gives you the ick. I certainly have some feelings about the organization myself. I'm assuming it was the TP USA connection that gave you the ick, not the images on it? As in, there wasn't anything overtly graphic or bloody, etc.? IF the printer is company property and not your own personal printer AND since you've allowed other organizations to use it, I'm not sure you had the "right" to refuse service for the new club (though I certainly understand why you would want to do so). Could you have said no and walked away while still allowing the assistant to print the flyers?