and yet when it comes to offline life people manage just fine to identify when people are boasting.
But they don't. People disagree about other people all the time and make subjective judgements. Pig headed or determined? Rude or forthright? And online interactions follow a different code, since the medium is different. We do interact differently online. Think we would be having this conversation, us strangers, if we met in reality? Think OP would walk into a bar and invite everyone to join her in hating on Facebook BD posts?
sounds like you're still trying to pretend that bragging/being boastful is just people saying something nice with the wide eyed 'but who says what it is to boast
But who does say? It's a fair question. You are not the authority and clearly we don't all see the same thing because I'm disagreeing with you right now.
I'm absolutely sure that the stuff that's got you and others so very exercised isn't likely to be vastly different to the stuff I saw, and I didn't think it was untoward. Let me guess: the stuff you share online is absolutely fine?
The fact that a PP had to give me a completely impossible scenario to make this point does indicate that she knew she didn't have an objective truth on what's unacceptable. There's a reason she didn't make an example of what she really saw.
We don't see things as they are, we see them as we are...