What the hell is wrong with looking up a word in a dictionary to be sure you understand the meaning or the nuances of its meaning. If you are going to the trouble of writing a blog post specifically criticizing someone, you had better use words correctly and spell them right too.
For example, the word "irony" has a more nuanced definition than you might think. It can be either: saying something but meaning the opposite, something happening when you thought/expected something else would happen, or its use in theatre when things are clear to an audience but not clear to the characters.
I'm sure there are plenty of other examples, but looking up a word and thinking carefully about its meaning is just good writing.
Its also an easy way to start an article. High schoolers do that a lot at valedictorian speeches. ;P
When people accuse you of something..."You're arrogant"...it doesn't matter if the word has a nuanced definition. "The people" don't use nuance. Now, if an intellectual makes a detailed philippic against you, it might be worth explicating carefully. Even then, probably not...especially if you're trying to sleuth out some deeper compliment buried in an insult.
I don't care if he's arrogant, for what it's worth. My problem is that he is a dispenser of humdrum truisms and humdrum falsehoods that mysteriously result in adulation.