No matter what the issue is, he always tries to pretend like someone extremely 'Mahaan' but actually he does not have a big heart to be Mahaan in real so that make him a confused and "Wannabe Mahaan" Person.
First on his natural impulse he rushed into confession room, attacking door and shouting biggboss mujhe bulaye, then later become a calm and poised person saying that I will accept whatever BB will decide for me and will never make an issue of this case. When BB finally evicted Puneet, he was an utterly polite and softhearted person saying that Puneet Ji I love you and that I'll meet Puneet Sir right after meeting my parents once I'll leave the house. And now when Puneet Sir is actually coming back then his gratification and trust for BB and love for Puneet Sir has suddenly gone.
Not saying if he was wrong or right in making an issue and making Puns evict but why the hell drama of being Mahaan. If you are selfish like Karishma then have dare to accept it like Karishma too. People who actually have respect for someone to the extent of not making an issues of their misdeed, act the way Gautam acted when Puns became physical with him during sweet making task. Neither he shouted in front of BB nor he said a word even to him later.