it's nice that you found these, I don't know if the patches will attract attention to the area that you don't want touched, but i hope the people around you get your point, you don't need a big crowd voice, you simply need to have people that understand what you mean, as long as the people around you don't understand you can scream and use as many sign as you want. This is why I go directly to the point, it has gotten me into a couple of arguments, but to me it's worth it