I am of the opinion that not discussing these things is an analog to the Paradox of Tolerance, if not being exactly what the Paradox is about. If we don't discuss the hatefulness, then the hateful think they are doing fine.
Attacking only causes people to "dig in". Passive aggressive actions will make you look weak.
Being cordial while also calling out instances of hate as they occur would likely be fine. Be strong and confident, but keep corrections short and to the point (Imagine correctly a 5 year old. Understanding and care, not anger, and keep things in reality.) "That didn't happen.", "Why would a criminal say that?", "Toddlers visiting basketball plays, will reduce the average height, but no one gets shorter or taller."
I have been puzzling on this, and am here to leave a link to a Wikipedia article touching on the subject. Jesus in comparative mythology