I do not want to see certain posts in my feed, ever. I want to define a list of key words, and any post that contains one of these words should be hidden from me.
Picture strongly related.
You absolute can become a professional computer toucher without having to engage with Windows. If you look at operating systems for cloud servers you will see that 90% of them are running on some Linux variant.
If you want to use your experience to work with linux desktop machines then that might be tricky. You will have to find a company that mandates to use linux machines. I think your best chances might be a tech startup that has not yet fallen into the windows trap.
Probably public education