Your caution is well justified. Don't do it. If the person's performance is impacting your work, then it's on-topic for you and your boss only. The chain of co

Your caution is well justified. Don't do it. If the person's performance is impacting your work, then it's on-topic for you and your boss only. The chain of command may seem fusty and formal but it was invented to handle personnel issues (among other things). It's a thousands-of-years old technology and you should use it rather than fight it.