Nail on the head. This is a clear example of FA power abuse reducing freedom. Although I have a different fashion aesthetic, I don't feel it my right to tell someone else to dress. The reason why I will avoid US is not that I'm going to change my attire (or attitude) but because next time it could be one of us.
This a slippery slope: we start out arresting people for wearing clothes we don't like, then start arresting people whose lifestyles we don't share, then other religions, etc. Even when I don't share the perspective of someone else in free country, that does not mean I feel that they should not be allowed to have that perspective.