Kenya and her mean behaviour

So I've been rewatching RHOA and I'm on season 12 now.

Does anyone know why Kenya is the way she is? She's so mean to people and actually really cruel a lot of the time. People say it's just shade but if you look at the things she says and does, it's all really awful.

• She was a nose hair away from ruining Cynthia's engagement.
• Alluded to Phaedra and Apollo having HIV
• Tried to sabotage Tanya's relationship and still called her the C word
• The nudes of Britt Eady
• Antagonizing Porsha until Porsha lost her s**t and dragged her across the stage
• Trying to sabotage Marlo's wig launch

These things are more than shade. They're downright awful. The nonsense Nene used to say could be offside sometimes but it was funny, Phaedra had funny shade until she crossed the line with Kandi.

Why is she like this and why is she unable to own what she does?