That's a really unhelpful response, because it just seeks to deny what that user has just experienced! A better approach is to say that MySQL just being incompatible with stuff is not something that's supposed to happen, but as part of asking for clarification on how the supposed incompatibility came about (or even simply as offering to look into it, if appropriate), so as to helpfully root-cause and troubleshoot the issue. The basic facts you're relying on are exactly the same, but the underlying attitude could not be more different!