Yes, friends who don't like us will always have a way to find our faults and if they have found a loophole in our fault they will be happy and report it to their superior, causing problems for our work, therefore it is better to use our times as best as possible so that people those who don't like us have no chances of making our name bad in the eyes the company.
We often encounter this in many types of work. A friend once told me about the tough competition at his company. Some relatives don't like the results of my friend's work even though my friend's boss knows that my friend can be relied on. But for various reasons, his relations tried to bring down my friend. But because my friend's boss knows how my friend works, my friend's boss prefers my friend and kicks his relationship or gets fired 
Competition in the workplace is fierce. We will never know who really likes us and who hates us. Those who hate us may pretend to be good in front of us but try to bring us down behind our backs. That is why we should not take any risks at work. If we want to gamble, we should not gamble at work. Unless we are a boss at our workplace, we can gamble in our room and forbid anyone from entering our room if we don't call him.