Menachem, the mishnah has a list of people who lose their olam haba, brought by and explained by the rambam. Embarrassing someone, mevazeh moados, etc…
Oseh maysoh amcha can include sinners who do not violate the things in that mishnah.
Aee bava kama 94b for starters; chazal darshen amcha / oseh maysoh amcha many times.
Most people who say not to judge are the ones who are the most judgemental. Take a look at how these people view satmar, or anyone else who’s frummer than they are. Or if a person violates something that they consider “really bad.” Most people are fine with ths “look at the pinteleg yid” if he’s mechalel shabbos, eats treif and spews apikorsus (I’m talking about people who know better, not people who grow up with no shaychus)….but if they support Palestinians(like many college kids) or if they’re guilty of something else that the “non judgemental” person deems truly evil….that pinteleh yid talk goes straight out the window