Stand-up comedian Patton Oswalt received some Twitter hate from a user who made an awful joke about Oswalt’s late wife, writing that he was “channeling [Oswalt’s] wife’s opinions.” An alt-right troll chimed in, calling the comment “hilarious,” when Kylee Koenig, a 13-year-old girl with osteogenesis imperfecta shot him down.

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The exchange started with the troll @hansolo telling Oswalt, “Get a sense of humor pls ‘comedian’. Arent (sic) you friends with Jim Goad? Harden up.” That’s when Koenig responded, “Easy to hide behind a screen to make these comments. Be a man put your words next to your real name. Coward.”

The conversation escalated from there, when the troll commented on Koenig’s wheelchair, and noting that “everyone feels sorry for [her].” Koenig responded with a smackdown, however.

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