Once, manners stipulated it was essential never to discuss sex, politics or religion if you wanted acceptance at a party and not inflame passion and ire against you.
Currently, sex, politics and religion seem absolutely safe.
The topics you should avoid discussing nowadays are Israel, Abortion and Smoking.
In fact, to stop the party and confirm you are persona non gratia in the eyes of your host simply point out that Israel is viewed by Palestine as an illegal occupying State, abortion is an essential right for every woman, and that passive smoking effects are lies concocted to promote sales for Big Pharma and that smokers should have rights. That should do it! Have fun!