What's your strongest-held opinion?
Try to put yourself in the other person's shoes, understand their circumstances then judge. If someone is doing something that literally does not affect you or anyone else, leave them alone.
We do not value humility enough. All of us, each and every one, are flawed and ignorant and speak beyond what we should because of our own biases on a regular basis. Too often we argue things or double down on things we are not properly informed about or have our judgement compromised by our own biases on and it only hurts all