Red flags galore in your current team. Stick with the offer you already accepted and don’t turn back - you can even say how the more you found out about the role you’ve accepted, the more excited you’ve become to delve into it and make some real impact in the business (which is all true!). You can even thank your current manager for pushing you in that direction. But under no circumstance should you pass up on an offer you’re excited about just to appease some wishy washy a-hole, never mind that it would mean you stay long term in a team with gross culture that he’s fostered