newfhouse
pleb
Is there not an assumption in law that words or phrases - and maybe the numbers being discussed here - are subject to a widely shared understanding? Otherwise couldn't you defend yourself against a public order or harassment charge by claiming that your speech was intended to convey your own peculiar meaning and not the one understood by the complainant?The fact that person A is offended at the use of a particular number because they cast meaning on it does not mean the person displaying that number is committing a crime.
You're probably right that it would be hard to convict on the basis of wearing that shirt alone. My prediction is NFA.