Educate those who do not know or understand the disease
If ignoring and being patient won’t work, then there’s nothing wrong about giving people a little bit of confrontation. This is just one effective way to make them stop staring at you like you are some kind of a mad person. Sometimes, making them realize about your Parkinson’s disease will surely affect them and might teach them a lesson. So, doing some kind of lecture might not be that bad. In addition, there might be some other victims of this degenerative disease that are not yet fully aware of its presence in their bodies, so don’t hesitate to have some talk with the people who are willing to listen.