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Pluralistic: "If buying isn't owning, piracy isn't stealing"
(pluralistic.net)
This is a most excellent place for technology news and articles.
Who cares what your associate uses as a definition, stealing / theft has long established definitions. You can just point and laugh and say that your associate doesn't actually understand the words he/she is using.
You could say that you define agreeing as "thinking someone is completely wrong", and that you agree with your associate.