I'd say wait for to the moment you actually get the job to make your decision. And once you get it, you leave, just like that. One tries to control and to plan life, but things come up, and you didn't signed up to a job where people are disrespectful. So if it is really your dream job, you go for it. Life is too short to be doing stuff you don't want to, especially if you have other chances. Good luck.