There are no laws anywhere in the world that state you have to be polite or nice to anyone.
I just don't know anything about the above statement you made and I don't care about it.
Just try that with the wrong character, anywhere on this planet, and you'll be history!
Reserve your colorful language to your home, family and friends, if you must - might save your limbs or even your life.
Most of these impolite a**holes, choose their 'victims' very carefully - the elderly, weak or a woman. And those who justify them are no better IMHO.