(You'll have to forgive the vagueness of this rant, but it's something I'd like to get off my chest without disclosing too many details...)
Did you ever know somebody with no filter? Someone who will just say anything--particularly if it's boastful and self-aggrandizing--regardless of the inappropriateness of the setting in which he or she is shooting off his or her mouth?
I have to spend a good chunk of my life in close contact with a person like this. As an added bonus, it is hard to have a relatively normal conversation of any kind with my No Filter person, which, for reasons I can't go into here, I need to at least TRY to do several times each week. He/she occasionally exhibits all the social skills of a small child suffering from autism--except this ain't a kid. And he/she doesn't have any kind of mental disability as far I'm aware.
So I end up sitting mutely through this person's commentary to third parties standing three feet away from me about, for example, his/her ex-flame which his/her spouse is still SO jealous of (as if I give a shit). And this person's odd criticisms of his/her own children. And his/her really unfunny jokes about current events (that situation in Austria where the father imprisoned his own daughter in the basement and forced her to bear 7 of his children--THAT was a real knee-slapper...)
They ought to give classes in social skills for adults. Except the people who need them the most, like this person, probably wouldn't go.