I think a lot of the trolling directed at you is because you clearly don't "get" what a part time sup does. You technically manage the people on your belt but going from loader to PT sup is a lateral move at best. First of all, when your belt does not meet its numbers you have to answer to the higher ups, even if there was nothing you could have possibly done about it, however you can't say that because it's "making excuses" or whatever. Second, lots of the hourlies will take out their own frustrations on you, so you get it from both sides. Third, you think you are done loading? In my experience PT sups end up doing quite a bit of that because the stress of meeting numbers and lack of people on the belt gets the best of them (and ends up with grievances as well). Most importantly you basically have to do whatever you are told with regards to working late, coming early, and working extra days. You lose union protection and are at the mercy of the people above you.
So you get crap from both above and "below", are the scapegoat for when things go wrong, the physical labor still exists, and your job is constantly on the line. I've only been working in a medium sized hub for around a year and every PT sup I've gotten close with has told me they regretted their decision to take that path. I've seen many melt down, get fired, etc.
Also the reason you get such a negative response is people that have put in decades take a bit of offense at statements like: "I am gonna be supervising are people like you who stay as loaders for the rest of their lives lol", because it's clear you don't respect the people that you are at least technically managing and because they've seen dozens of people just like you come through and get burned before.
