Uh, if this gentleman has the freedom to print such t-shirts, then I see no reason why others cannot also exercise similarly protected freedoms by complaining.

Uh, if this gentleman has the freedom to print such t-shirts, then I see no reason why others cannot also exercise similarly protected freedoms by complaining. As for the rest, to paraphrase an Australian fellow, the standard you walk past is the standard you accept. "Just ignore it" at a minimum enables, if it's not tacit approval.