I think the situation was unwinnable. You've exposed their incompetence. Rightly or wrongly, most people can't stand being criticized. If there's a solution to that one it's a diplomatic one, not a technical one.

Be similarly wary to point out bugs in code reviewer's code. Unless you have a healthy professional atmosphere and multiple reviewers, your best course is to manipulate the reviewer into "coming up" with the idea for the bugfix from your ticket.