I'd say - let it go Harsh. You must be confident about yourself and I'm sure you are.

But putting aside the level of experise you and they do or do not posses did you feel comfortable arround those people?
If yuo did not you wouldn't last a month there so there is absolutely nothing for you to worry.
Based on what you said those folks are full of arrogancy and sarcasm - personally I would walk away right after "Reaction #1..." but maybe even earlier...
If chemistry isn't there from the very first minute then you are in the wrong place - that's my obsevation anyway.
Another thing I would suggest is you need to be very relaxed - it's just a darn interview so try not to stress over it.

Really wish you best of luck. Common down - I'll get a nice job arround here.