Something like: This person gets put in my personal ignore filter, which over time will get better at predicting who and what I want ignored. I can always go back and review what's being ignored and make changes. Individuals and their content can be ignored separately, so "I don't like this topic" doesn't ban someone who I like to engage with on other topics.
I'll also tag this person as a flat-earther so my computer will learn to cluster similar content, so I can query "flat-earther" when I want a chuckle.