I know there was a post like this a few days ago, but bear with me. I could not think of a single spoken or written pet peeve at the time (weird, right?) BUT I HAVE ONE NOW, and to me it's a doozy.
Here it is: when people write the word "dribble" when they mean "drivel". They are not the same word, y'all. They are not interchangeable.
Please add your own word rants or other pet peeves if you feel like you should.