Someone or something you definitely could live without.
Naysayers. Two of my biggest pet peeves are people who operate out of a half-empty glass perspective and those who always have a "could of, should of, would of" response ready at all times. I can't. Naysayers waste time. My glass is always half full and I try to stay in motion. So, even if I could have or should have done something a certain way ... I refuse to let that be a hindrance. Instead of could of, should of or would of, you're likely to get "now what" from me.