In an argument where would you say the point of no return is?

At what point has an argument gone pass the point of no return? If two or more people are in a nasty heated argument then someone brings up a fact than no one knew up until the moment it got said in the ear shot of others like ”at least I didn’t lose my dad to prison because he was molesting me since I was 11yr”, _“at least I didn’t steal $52,000 from the union pension fund I was entrusted to manage”, at least I didn’t have sex with my cousin’s wife the night before their wedding”_, ”I didn’t have to have sex with my cousin in order to break my virginity”, etc would that be past the point of no return? To out someone’s deep secret like that is there any give back you could possibly do to make that better? Once out you can’t put a genie like that back in the bottle. And if it was a friend or family member you outted like that is the bridge burned forever or in time you could build it back?