People will be people, but it just gets on my nerves when I'm clicking through my deviations inbox and I come across a stamp that says something like "if you don't agree with me, you're a jerk".
(To think they were stupid enough to actually disagree with you! My! Because people shouldn't think for themselves. They just need to listen to you as you think for yourself--amirite?)
First of all, I find this very rude and inconsiderate.
Second of all, this is a logical fallacy called "ad hominem". In other words, attacking the person instead of the argument. It does nothing to support your case, and makes you look just jerk-ish as the people you're dissing.
Third, even if actual, even sound, arguments are provided in the description, people are MUCH more likely to consider your view when you're not being super rude about it. If your goal is for them to come to agree with you, why not do it in a pleasant, or at least halfway pleasant, manner?