[nrat]

Is no one considering the fact that this "slacker" is in a place of seniority over OP?

How could one possibly aspire to climb the ladder when the person above you is unlikely to ever move up another rung?

If slacker never gets promoted, due to their lack of performance, what chance does OP have? Or should OP find a better paying job elsewhere where this is not the case?

I am not advocating for snitching here, but let's consider it from that vantage point at least.