I do interpret what you wrote as a slightly less sensitive version of "If you don't like it, then leave," type of comment.

That type of comment is doesn't say anything, there's no real argument in it. It's simply dismissing criticism. You can dismiss any criticism whatsoever using it.

The sweeping "if you don't like it leave" doesn't really work. There's good reasons to use a platform despite deficiencies, no platform is exactly how I'd do it. Perhaps Google+ is technologically better, or the audience on Google+ is better for what I have to say. Maybe I want to keep in touch with real life acquaintances and they are on Google+. Do I have to convince every contact I have to switch to a platform that is worse in different ways?

Even if I vehemently disagree with their stance on publishing your true identity; there's reasons to use a platform despite it and keep complaining about their bad policies.