I'd argue you're still at liberty to do it - you just have to be willing to accept any social prices associated with it. Other people enjoy the same liberties that you do, they have every right to think and say whatever they will about you due to your speech.

Of course, this is really only a significant issue on a public forum, on which you can post pseudonymously and still gain any benefits of discussion without paying any significant toll. Some people view this as a negative and want to ban this kind of commenting - I love it, it means you can experiment with different views, make arguments you might not want to make in real life and see what sticks with you.