Brad Pitt has pissed off a lot of people, so he says, because he fails to recognize them ... but Brad says he believes he suffers from a medical condition called face blindness.
Brad has talked about this struggle in the past ... he just can't recognize people by looking at their faces -- even family members.
The condition is called prosopagnosia ... in lay terms, face blindness. About 2 and a half percent of the population suffers from it in varying degrees. Some researchers have theorized the condition is brought on by underdevelopment in the womb.
Brad has said over the years he's taken a lot of heat by people who felt he was aloof and self-absorbed ... because he didn't care enough about other people to remember them. Brad tells GQ, "Nobody believes me!"
The 58-year-old actor says he's never gone for an official diagnosis, but he's confident he has the condition.
As for how people with the affliction deal ... they use other markers to ID friends, family and associates ... it could be the way they walk, their voice, etc.
Brad told Esquire back in 2013, "So many people hate me because they think I'm disrespecting them."
Brad was brutally honest about lots of things in the interview, including the heartache he felt after the collapse of his marriage to Angelina Jolie and the bitter divorce that followed. He said, "I think all our hearts are broken ... I always felt very alone in my life, alone growing up as a kid, alone even out here, and it's really not till recently that I have had a greater embrace of my friends and family."
Brad is clean and sober, having spent 18 months in AA. He's also cut out cigarettes.