> For example: If you say "Joe is a liar" and then you are heard saying "I said that to ruin his reputation" it should be criminal.

That's what slander is. It's already illegal (not sure if it's a felony, though, or just a misdemeanor).

Apart from slander, though... strong disagree. You should be able to be offensive. Being offensive is in poor taste, and often is also poor tactics, but it shouldn't be illegal. Best reason why: "When it's illegal to offend, being offended is a weapon." (I stole that from someone here on HN, but I don't have the source handy at the moment.) I do not want to give that power to every busybody and power-tripper with an internet connection.