Why did that man feel inferior?
The man was suffering from feelings of inferiority and inadequacy; when such feelings control the behavior to that extent, it is then called inferiority complex. The cause of that man’s inferiority complex is deeply rooted in his childhood; when he was a kid he was physically weaker than the other kids his age, which lead to them beating him up, taking his lunch and calling him names. Years later, he is now a very social person, academically very successful and a great basketball player. Yet, the feelings of inferiority are still lingering there.