agree, i also do it when someone does a very discriminating joke about a group of people, either by their hair color or something about them that they cannot help.
I think I've only blocked porn bots on tumblr and people I hear about on FA that cause trouble for several users. I'm probably the only one here who hasn't blocked someone I've known (but I've been tempted to), is that weird?
im usually tolerant but folks do cross me and i upmost block em.
its why we have a block feature.