I know where you're coming from, but as one who has been around a lot of racism and dehumanization, I feel very uncomfortable about this stance. Maybe it's just me, but as a teenager, I also spent significant time considering solipsism, and eventually arrived at a decision to just ascribe an inner mental world to everyone, regardless of the lack of evidence. So, at this stage, I would strongly prefer to err on the side of over-humanizing than dehumanizing.