When given cash for payment, the lady server asked if we needed change. I find that practice insulting. Considering the amount of the bill and the amount of cash given as payment, no change would have meant a tip of over 20 %. Why ask, simply give the change and let the customers decide how much they want to leave for tip. It would also be nice if the server would ask if she should bring separate bills instead of assuming that one bill would be OK. I hope I get a different server next time I visit Spin Kitchen.