DISCLAIMER: In no way do I think this situation is at every UPS operation, this is just my experience and observations at my building
they tried this crap when I was transitioning as well. Not nearly as involved as yours. Saying my attitude was bad blah blah blah, that I didn't care about the job (loading). All of which was complete garbage. I always did whatever was asked of me (within reason) when it came to UPS (first to volunteer to help, come in on sat, etc). It got to the point where I flat out told one of my supes that I do this job to the best of my ability and then I go home. Thats all I have to do and if thats not enough then too bad.
In that aspect my job hasn't changed. When I walk out the door my ties to UPS are severed. The sole exception is PEAK (one week I worked nearly 47 hrs...preload stuff only...no extending), and if certain supes who treat me well need favors. When I'm in the building I play by the rules (even if they don't sometimes), and do my job the best I can with the time allotted. I know my questions, the ESTA key points, the commitment statement etc. cold so they have nothing to get on my back about. Lately, they've been really pouring on the nitpicking in our building for some beneficial outcome yet to be revealed. Our workers are pissed off, many management members disgruntled as well so I hope that promised land that is to be the result of all this reveals itself soon.
But me? I like my job. I still dislike the hours (lol) but I don't let anything they say get to me, and usually disregard the "comments" because normally the person making them has no idea what they are talking about and/or are doing so without the correct information. I bend over backwards to help the people who need the help in any way, those people being my preloaders and the drivers on my line if they have questions. Are we always on the numbers? no, but then again, I don't think someone can safely load 1100 packages by their numbers when 60% of it comes after break and they want us out by just over 3.5 hrs for preloaders. They don't say they want such things, but to make the numbers they want (not necessarily what's required) thats what would be necessary. The job is what you make of it, if you're easily hurt or take things personally then this really isn't the job for you (not trying to be a jerk) as they nitpick and some really inflammatory things at my building sometimes (actually its one guy and he THINKS he's being funny, he really just pisses people off). Whatever you do, don't lie to your people. Do it and they'll know it, if only my boss could figure that one out.