>>29681444TL;DR there is no actual reason, it's just a defense mechanism for idiots that think an "entertainer" should fuck them.
Because in the unironic incel coombrain, when a man and woman interact or even the mere mention one by the other, it can only mean sex. And when they see their favorite streamer interact with the opposite sex, it triggers massive envy because if their fake internet personality is going to interact("have sex") with anyone it should be with "ME!". Their only cope is to call the streamer in question, usually a female, a whore