This morning on the preload I had a run-in with a full time sup. I work in the primary as a SPA clerk. I had just finished getting crushed on my belt and my pt sup diverted my volume to the other belts and walked away. I've been hurting lately so I took a seat on one of the slides. FT is on the catwalk above me and asks me if I'm familiar with the secondary (he cut too many people and they were getting hammered). I told him no. He asked me if I would be interested in going up there. Again I told him no. Just for a bit of background- normally I would have been more than happy to go help out. He's asked me before to help unload after I was off the clock and on my way out and I obliged. I'm SPA only so I didn't have to help him out. When I asked for a morning off thinking that he might scratch my back since I scratched his, he told me no. Thus my refusal this morning. He then went on a tirade about how he was paying me to sit around and do nothing. I told him that I did not control my flow and that my belt was running. He then said that I was not allowed to sit and that he never wanted to see me do that again. "It is disrespectful to your fellow employees that are actually working." He then asked me twice in a nasty tone "Do you understand me?" I was livid but bit my tongue. My pt came back and gave me more volume to scan. This guy comes up there about once every 3 months. I'm sore and tired just like everyone else, except I actually come to work. We were down 4 people already out of 9 because he let 3 go home and one is on vacation. My pt knew I was hurting but didn't ask me if I wanted to take a paid actual. My total scans and PPH are tops in my area and I copied the numbers down from the computer to prove it. I was going to go talk to the Package Center manager but he was gone today. I could and should probably just let this go but I have a real problem with people insulting my work ethic. If I didn't come in every day and/or sucked at my job I could understand it.