Blogging requires that you develop a thick skin pretty quickly, but after doing this for years there's still one thing which can occasionally set me off and I think it's true for many other bloggers too. It's the broad genre of "what you should write about on your blog" though it also includes "issues you should care about," and "opinions you should have." This is combined with a weird notion that if only something appears on this blog that the world will change, or something. I'm never quite sure.
And there are the people who think that this blog should be a data dump of everything I think about everything. As is the case in real life, some thoughts and opinions I just keep to myself, though usually not because I fear angering George Soros.