Anything you say or wear can and will be against you in a court of law.
Funniest "Obama" shirt I ever saw: a burly young black guy was wearing what appeared to be a sports jersey, with
FUBO
Across the back. Maybe it was the guy's name, or perhaps the name of a local (Japanese) team sponsor, but lol.
I wanted so bad to ask him if he was a member of Free Republic, but I strongly suspected that that wasn't the case.
If I saw someone trailing TP I would discreetly say something to the poor person, but a FUBO shirt? Some things are better left unsaid.