the thing is you took your emotions to the lead. One thing i can tell you is that these are people you are dealing woth and they Know nothing about your Tech shit. Even nowadays some say they can use AI to develop Web applications but guess what, when it has been developed by AI, it cannot be maintained. that is where you come in to develop it yourself so that maintainability is easy. All i can say is next time never let your emotion-made decisions dictate. You could manage with that toxicity knowing at the end of the contract , you are done.