When you have a cheering squad for your blog, or followers who eagerly read each missive you send them, it's easy to forget that the world at large doesn't necessarily share their attitudes—or yours. You'll be tempted to dismiss someone who posts or sends severe disagreement as the rant of a crank.
The dynamics are quite different for a book or for an article by you in a publication or blog for a general audience. In such cases, there's less self-selection. People approach your content without knowing much about you, being pre-aligned with your perspective, or already being fans.