Off The Waffle interview questions

Very informal interview, just asked why I wanted the job and asked a little bit about myself. I was offered the job immediately, and later in the day when I asked the owner, Om, about pay he told me what the normal baseline pay was and for further questions about pay, to discuss it with the manager. I took this to mean that all pay negotiations would be discussed with the manager so I texted her my hourly expectations and was accused of trying to trick her into giving me a higher pay. The lack of communication between management and the fact that this was then blamed on me was incredibly disrespectful and unprofessional.