30 years ago my coworker took my work on my day off (after I was with the company for 2 weeks) and went to the boss to show off "her great results". My other colleagues saw this happen and when I came back the week after, pushed me to go complain to the boss. He literally told me: "Y'all think I'm stupid right? Of course I know she didn't do any of these things; zero skills. It made no impression, so just chill."

I guess from that point on I have considered colleagues like this noise and a waste of my time. So I've just ignored them ever since.