Because she was acting like a prostitute.

Call it the way it is. Y'all are always crying about people ****-shaming people, but it's one thing to say that one is acting like a prostitute, but it's another thing to poke fun at a mental condition. She not only disrespected Sinead's condition, but name-dropped Amanda, who had absolutely nothing to do with this ********. She's rude and grotesque.