Freedom Of Speech ----- Just where is the limit?

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I read some discussion here, and it had a person constantly saying that this site is an American site, you have a freedom to say whatever you want as long as you are not offendidng someone personally. I agree to that, but is that all? Sometimes you are not targeting a specific person, but the object of your criticism may be much dear to them. So how can you say that they are trying to mute you when they are mere protesting. (....I would like to clear that the person in question was not doing it wrongly, as it was not a mere protesting but an appeal to ban this user.) It's better to put your opinion in non-offending way unless it has a strong reason to be put in somewhat strict manner. What do you think about it? I would appreciate to hear both the sides (supporting and opposing ones) as it makes a clear view and also I don't get both of the view in the same place. Discussions just turn to fights before that:(