I can't agree with the boss because is there really a correct way? I mean, the 'correct' way is what everyone agrees upon. But it seems that so many people do so many grammtical things differently, there isn't a right or wrong way anymore. Sure, there are those that'll argue that a certain way is right because a certain rule says so, but honestly, who cares?
And yes, if a boss were that strict, I would just look for a different job.