Grandparents watching Fox News or saying something racist over Thanksgiving dinner doesn't make them horrible people or evil. They are a product of their time, as are you. This doesn't excuse their behavior, but it doesn't by itself render them subhuman or worthy of hate.
Prejudice is best counteracted by engagement, commerce, and exposure. The vilification of political enemies in the US was understandable given some of the truly horrific things done as recently the 20th century. Today's 1st world should be a different place.