if you're going to wear the TF brand then at least show some acknowledgement when a real fan comes along and addresses you.
Didn't know there were certain laws for certain clothes. Go for a walk into the city and tell everyone you pass that they have a cool shirt, no matter what they are wearing. See how many people acknowledge you and how many ignore you or tell you where to go. I bet the latter outweighs the former. What happens when TF becomes totally mainstream and every 2nd person is wearing a TF shirt because they look cool?