This is something I observed in the response to my unfortunate surgery experience 13 years ago: suddenly I became an enemy and excluded from community where I had been embraced for 10+ years because I was undergoing a difficult experience that was deeply uncomfortable to them.
Handy Dani Dyke
And the specific thing competition does to your brain, once you know about it, is hard to unsee.
We *stop being able to fluently access empathy* when our cognition is pointed at grouping the world into opposing sides.