First, please allow me to express my sympathy. You are obviously a sensitive person, and feel hurt by what happened in that other forum. But as others have noted, you don't have to be there, and it seems like it's vexing you. You are welcome here by most posters.
Judging someone according to their belief or non-belief is no different from judging them according to the color of their skin. People are people and they should all be afforded the same dignity and respect.
I'm assuming that you mean religious beliefs. I continually judge people by their beliefs and bet that you do as well. I judged the tiki marchers at Charlottesville adversely for their bigotry. Somebody left a post on this thread mocking taking climate change seriously. Opinions like those tell me a lot about a person's character and / or how a person processes information
There is no such thing as correct when it comes to beliefs, since they cannot be proven true or false.
Once again, I'm assuming that you mean an unfounded belief held by faith. Some beliefs are well supported. I'm expecting to go out in the car this afternoon, and I expect it to start when I turn the key in the ignition just like it has the last several hundred times it was tested.
"Proven" and "true" are words I'm using less and less. If an idea has demonstrated its usefulness in reliably predicting and at times controlling outcomes, the idea is a keeper and is appropriate to add to one's fund of knowledge whether one considers that proof or not. Consider these terms:
- Instrumentalism - belief that statements or theories may be used as tools for useful prediction without reference to their possible truth or falsity. Peirce and other pragmatists defended an instrumentalist account of modern science.
- Empirical adequacy - A theory is empirically adequate, roughly, if all of what it says about observable aspects of the world (past, present, and future) can be confirmed
- Fallibilism - the principle that propositions concerning empirical knowledge can be accepted even though they cannot be proved with certainty.
Some beliefs can be regarded as true if they can meet these criteria without troubling oneself with ideas like ultimate truth or absolute truth. Newton's work on celestial mechanics was improved upon by Laplace and Einstein, who demonstrated that Newton's work was incomplete, and for certain applications, inadequate. Nevertheless, Newton's equations can be used to send a probe to Pluto and expect them to rendezvous in a time and place anticipated by those equations. Is Newton's work true? It's surely useful, and that's what matters.