Joy Reid leads this episode of The ReidOut with the heroic actions of the man who wrestled the gun away from a mass killer in California on Saturday night. Mayor Henry Lo of Monterey Park, CA, where this tragedy took place, joins us on how his community is coping. Also in this episode, Joy is joined by Florida historian Marvin Dunn, who sees what Ron DeSantis is doing to criminalize the teaching of African-American history, but says in response, "We're going to keep on teaching it." Plus, we cover Donald Trump's controversial appearance at the memorial service of one of his biggest fans. We also bring a vile display that took place in Kentucky to the forefront: restaurant patrons there were forced to listen to audio of the killing of Breonna Taylor. This, as one of the officers involved in her death was there to speak to a group of Republicans. All this and more in this edition of The ReidOut on MSNBC.