Don’t be afraid to make people uncomfortable. Don’t be scared of making waves and ruffling feathers. That’s the only way to stop the sheep mentality, it’s the only way to out and call people to attention.
For example, if a guy inappropriately grabs you in public, definitely make a scene. After all, he just did something wildly inappropriate. You know he may deny it or call you a crazy person, don’t care. The more people speak up, stand up and make scenes the more these creeps will think twice about it before acting on impulses.
At a minimum, it is human nature to be curious. People will look. The guy will back off. You will be safe. You will be in control.
At best, someone will actually stand up and help you.