Holiday gatherings often find us surrounded by family members and old friends who don't see the world the way we do - and that can mean enduring hurtful or offensive comments. While we don't encourage causing big family fights, it is important for your mental and physical health - as well as for the greater cause of stopping the spread of misinformation - to speak up. Here we provide some factual responses to some common misconceptions, as well as some ideas for tactful delivery.