A thought is just a thought.
It comes and goes. It might come back, and certainly it will go away once more.
The challenge is that often we take that thought and build our reality around it. That person is mean to mean. Nobody wants me. I am not good enough. And by doing that, we twist our reality to match the thought. The thought will stay and we become conditioned by it.
Blow thoughts away, particularly the negative, devious, perverse, mean ones. They are just thoughts, until you build them into something bigger.