Anyone can flag anyone here, not only the whales on the site and for any reason. This is a community and if you are not contributing with entertaining content or some other similar fashion then you won't make much progress.
Freedom of expression is the right to freely voice yourself and your opinions. It does not mean that your expression can or should be accepted by anyone else. If you are expressing yourself in a negative way then you can expect negative results just the same as with anything.
This site is highly experimental and there really is no true or false prediction of where it will lead to.
And as a vote of confidence on my part, I feel I should inform you that you can only be silenced when you decide to stop speaking. Nobody else is capable of controlling anything you do in any way other than persuasion, of whatever form that may be.