Ive never met anyone who was one of them where it was a philosophical discussion. It was either told to me in passing (Not that they told me they were committing any specific Averiah) only that they felt that way. They might tell me directly that they were leading an “Alternative Lifestlye) but not they committed any Averiahs from Vayikra specifically
Or their mannerisms are such that give off that they are such a person, You do not need to ask.
And BTW just like on the Job you are not allowed to quote Psukim in Vayikra about this Averiah, They are not allowed to tell you that the bible is fake and “Phobic” against certain kinds of people. They will get in trouble for that.
It is possible you might see someone being Mechalal Shabbos or eating at McDonalds. You are unlikely too see anyone doing averiahs specified in Vayaikra even if you suspect they are Oyver them