You might be surprised at how many people get ticked at people who are early, particularly if they themselves are chronically late. I am chronically early, often arriving a half hour to 45 minutes early for appointments. I know i'm an early person, nearly always, so I always bring something to work on while I wait. I have gotten the "look" and comments from people with whom I have an appointment, because i'm early,lol. I'm like look, I don't care if I have to wait, at least i'm here and I can keep myself busy while you do your thing.
ETA: I'm also chronically early for work and I get the stink eye from coworkers for that.