being a cop, or being in the military (western). It's not the act itself which is unforgivable, but joining either of these groups shows that you lack judgement and that you are untrustworthy, which i don't have the patience or energy to navigate in my life.
Encouraging people to get the depopulation (emergency use authorization mrna) shots is also disqualifying to me, especially if you claim to be scientifically or medically literate, these people definitely should have known better. Usually you have to go back a few years in a person's post history to find how the behaved during covid. Not believing in bodily autonomy or informed medical consent when it really mattered is bad enough, but the unforgiveable thing to me is the lack of basic first-principles reasoning and also an inability to read scientific journals criticially. Like if you are going to bother reading them, especially if they are otherwise out of your wheelhouse, you can't just uncritically accept all of their findings without critically assessing the method, and comparing the results to other more established research. Super basic shit. But the bar is so low and was even lower during covid that just reading an abstract was enough to make you an expert. And the actual 'experts' were so cautious about losing their jobs and professional reputation that any scepticism or red flags they raised in their research were worded very subtlely or even pushed down into a kind of sub-text. Don't read a single article and then pretend you are an expert! for a complete noob you'd be better off understanding some of the important concepts, then developing a first-principles understanding of the problem space, and then to read specific pieces of research to improve the resolution of this picture.
But people don't read these things to learn or improve their understanding. They do it for a million other boring, pathological or career reasons.
In my weaker moments i shrug my shoulders and figure that these people aren't going to be great to have in the human gene pool anyway, but this dehumanising malthusian thinking is itself disgusting. I avoid depopulation advocates (knowing or unknowing) not because i value their lives (even though i do) but because i find their method of thinking repulsive.
Also anybody involved in real-estate.