Is it harassment to tell someone to do their job? I have a coworker that I come in after at work. He

... never does his job and I have to do my job and his when I get to work. We can punch in 30 min before the start of our shift but we are not late till on the hour. I started coming in as close to the cut off as I could to get back at him for not doing his job. He comes up to me and asked what we can do to fix this. I said just do your job and that's it