What is toxic yaoi?

Recently I had looked for recommendations (on twitter) for toxic yaoi but when I read the recommendations they all included rxpe + other non consensual abuse. I was under the impression that toxic yaoi was a toxic relationship where the relationship is hurting both or one people emotionally, for example banana scandal. Yaoi that includes rxpe etc. I would consider that dark yaoi but idk. So now I am left wondering what is this toxic yaoi everyone is talking about?