No matter how self-critical, I think we all have blind spots, faults that we don’t know we have but that others see plain as day.
And I can see that your environmental stance could garner you enemies as could your views on open source art.
Once back in college when I had received a piece of hate mail and was fuming about what poor harmless little me could possibly have done to deserve this, my husband — who was not then my husband — said “There’s always going to be somebody who hates you.”
The question might be whether those people make the best mirror to gaze into. Hate is irrational.
Your friends might be a better source — if they would be honest. I know what you mean about over-exuberant praise.