During the third Democratic Presidential Debate, Castro was accused of ageism after he attacked Joe Biden in a heated exchange over health care plains with Castro taunting Biden saying "Are you forgetting what you just said two minutes ago", repeating it multiple times. Castro was rebuked for his remarks by various members of the candidates on stage including, Andrew Yang, Amy Klobuchar, and Pete Buttigieg. Castro was widely criticized for what was seen as a "low blow", and with many accusing Castro of "bullying", and engaging in "ageism". Journalist Gayle King saw the interaction as a "personal attack". On "The Late Show with Stephen Colbert", Stephen Colbert described the interaction as both "mean and inaccurate", since Castro was factually incorrect in his attack against Biden according to Politifact.