Show them this thread so they know to find another job, because you're obviously not going to treat this person well as a direct report.
You're here saying they're being negative, but you're not saying whether they're right or not, and if it's appropriate. They're going to have a bad time on your team unless you change your ways.
You're here saying they're being negative, but you're not saying whether they're right or not, and if it's appropriate. They're going to have a bad time on your team unless you change your ways.