Or, "we had differing opinions on how to develop and maintain quality software." You can then answer almost any question (even, "what was the disagreement?") with your ideals, how you've put those ideals into practice in the past, and nothing more. You can indirectly explain the problem while keeping the conversation focused on the purpose of an interview: you and your prospective employer.
The danger is coming across as someone who is too fixed in their approach. I'm sure we've all worked in the past with people who thought they knew everything and walked around saying 'why won't everyone just do it in the way that I'm saying'. Focusing on specific issues and ways you worked with the organisation to improve things avoids that potential categorisation.
