But, if I say that they are against everything and are not for anything, the libertarians will become indignant and offended.
Then you need to read it again.
But, if I say that they are against everything and are not for anything, the libertarians will become indignant and offended.
Of course they will -- people do tend to become indignant and offended when you say ridiculously simplistic things about them which are not true.
You may not agree with libertarians, but it's ludicrous to claim that they're "not for anything".
Try raising the level of your analysis and maybe people won't find your comments as offensive.