It's called over-engineered culture fit. You've failed the culture fit portion of your hiring interview. Please find your own way out.
Remember (like, eight years ago) when you could get a job by doing good work and tolerating coworkers for a few hours a day? Now jobs mean you have to do good work, buy in to the koolaid, love your coworkers, and spend time with them before and after work too (or else you're not a "team player" or you're not "fitting in here"). You should definitely not hire people you can't stand, but there's a continuum between "this person has an abhorrent personality" to "no mad skillz pongpinging? NO HIRE!"
The startup tech industry is freezing out the leave-me-alone-i'm-working computer person archetype in favor of cheerleader/frat/bro/übersocial/drinkydrinky people. Who are you leaving behind?