My number 1 red flag is they have relationships that don’t last. I remember I had a girlfriend in college who didn’t have any girl friends, just guy friends and even they weren’t around long. I found out it was because she was an attention seeking narcissistic cuckoo.
Also, my Uncle is a chronic liar. He is VERY entertaining, but a liar none-the-less. He will move from group to group until somone finds out he’s full of shit. From a social club, to adult sports, a biker gang, camping club, and the list goes on and on.
My number 2 red flag is that they can’t be corrected or are never wrong. They are willing to argue ludicrous points just to feel right and relevant. They also pick the dumbest things to argue over when all they have to do is answer something like, “That’s crazy.” Normal people eventually admit fault and learn. Narcissists will never learn.
My colleague is similar and it’s stupid because you can look anything up on the internet. Also, I don’t like him any more or less for being right or wrong, but I do like him less for arguing about everything all the time.