I couldn't number the times I've been told to "sit down and shut up" because a difference of opinion with a woman is mansplaining, a difference of opinion on race issues is because I'm a privileged white racist, a difference of opinion with "trans" is because of a phobia, a difference of opinion with young people is because I'm a boomer. How can there be discussion in the face of that kind of bigotry that is perfectly acceptable when aimed at one demographic?