That is exactly right, and I'll show you why.
Example A:
Example B:
Now, do you notice a difference? Others mention that you are an intelligent person. You should be able to see how those two insults differ.
Obviously you aren't going to get it, so let me explain. In example A, there is creativity and humor. In example B, there is only sarcasm, and a possible attempt at humor(I can't tell).
The reason people are seeing you as "the jerk" is because of posts like example B. Your recent "flaming" just comes off as bitterness. A simple "You Suck/generic sarcastic remark" or the "improved" line that you've used so many times, doesn't have any entertainment value, creativity, or quality at all. It may get your opinion out, but it sure doesn't show that you are any more entertaining or intelligent than the poster you are "flaming". Therefore it comes off as whiney, especially when it's done so frequently.