I find that I naturally frame myself reading comments of my work as being inherently "with" the person. Think of it like watching a movie with someone, you both can comment on the movie you're seeing, and you naturally see yourself either agreeing with their critique or forming your own critique based on it.
In the same way, detach yourself from the work, and instead view your work on equal footing with your reviewers - this naturally leads to a more objective view for everyone involved. Reply not to their criticisms of _you_ but to whether you agree objectively or not, or perhaps suggest a different way they can look at the work. Oftentimes, after reading someone else's critique I can be self-critical in a way I wasn't before and it will lead to me refactoring a bit in response to my new perspective on my work, instead of completely taking their critique at face value. Use it as a perspective shift, but don't take this method as a way to lower your self confidence and give in to critical feedback.
Now I'll admit what I have more problems with is when someone clearly doesn't "get it". I'll bend over backwards trying to explain my rationale, when often the right thing to do is to try and understand what about my content caused them to be confused. Now of course, some people just plain don't get it right away and you should always feel free to defend your ideas.
As for snark.. defuse with humor. It's not always intentional, I've unintentionally come across this way (if you haven't you're probably holding in too much feedback!) so feel free to quip but don't go tit-for-tat. Try and cut through to the core of their feeling about *the work* (read: not you) and address that instead.