Hey Zobi,
It depends on the situation and the AGE of the guy. The younger guys might deliberately (purposely) project a "bad-boy"....."ghunda" ....."misfit"....."rebel".......personality in order to attract the ladies. Or it could also be that the younger guys want to look "cool" or fit in with the "cool" crowd. Or..........that could simply just be their NATURAL personality. Maybe that's just how they are. Maybe they can't help being aggressive/tactless/reckless/brash. Maybe the home environment they were raised in was dysfunctional and promoted such behavior.
For the more OLDER guys.....who are more mature.......perhaps they are showing a girl their true colors as a way of being honest. For example, a desi guy might choose to be honest about his unsavory past (drinking, sleeping around)..........because he feels that it's better if the girl hears the truth from him as opposed to finding out the truth from others in the community....and then accusing him of "hiding" things about himself. OR in rare cases...a few guys.....tell a girl about their bad habits to purposely turn her off.
It's not only guys, Zobi. Some women can be like that. Sometimes, women can be shamelessly catty. I've even seen Aunties who will make such absurd and offensive comments without the slightest thought about the audience....or even how their words might be percieved. And some aunties will commit their verbal blunders time and time and time and time again. Pretty soon, you begin to notice a pattern and you come to the conclusion that either the woman is totally clueless or she's being catty/condescending on purpose.
It's not only aunties. I've even seen young women.....lose control and say horrible things. Some tend to lose control more often than others. Some like to engage in cunning/manipulative behavior. And you wonder..........."Do they CHOOSE to show themselves in a negative light?"
I think ALL OF US have lost control of our tempers.......and revealed our dark side or ugly side to family members/friends/co-workers/acquaintaces/even strangers. But.....some people.......display negative behavior more frequently than others. Why? I don't know. Could be stress........a naturally short temper/fuse.............or YOU'VE DONE SOMETHING TO OFFEND THE PERSON AND THEY FINALLY DECIDE TO LET YOU HAVE IT.............or bipolar disorder..........etc etc etc. (Could be a slew of causes).