I usually do, but if the constructive and sarcastic people get to voice their opinions, then the people who disagree with the sarcastic/constructive people should be able to as well.
Also keep in mind Beeroshima, that while this is a public forum we don't necessarily have "freedom of speech" so to speak. The mods determine what matches the level of respect and courtesy that they want. So if someone feels that an individual should be told that the best idea would be to keep quiet, they should be able to. Especially if they want to warn them of being too sarcastic and/or disrespectful. (Not saying that was what was going on, but I'm sure you get what I mean)