Here's the deal - Both Sid and Asim are insecure. Sid has totally changed and is now chilling with everyone which Asim doesn't like since Sid himself insisted that Asim not talk to them for the first month. Sid is becoming insecure that Asim is gaining popularity, growing out of his 'sidekick' status, and gaining supporters of his own in the house.
But the real question is - IS VIOLENCE ALLOWED IN THE HOUSE? How the hell did Bigg Boss not intervene? Remember when KRK was evicted for throwing a bottle? This is a full on shoving fight between two strong, muscular men fully capable of hurting the other one very badly.
For the record - I support Asim because Sid is displaying a really pathetic, inferiority-born-superiority complexed, 8th grade bully behavior not just to Asim but to everyone. Plus, he was physical first in their last fight. He came up to Asim's face and Asim just elbowed him to move away and he violently pushed Asim on today's episode. Plus, the way he talked to and about Rashmi today. He's becoming completely unlikable now, and frankly, if he doesn't get a huge earful by Salman, then he's only going to become more and more unlikable.