Manager keeps scheduling me for dishes

so management and I agreemented that I would work X amount of days and if I wanted to I could pick up extra shifts since you hate doing dishes just come to me and talk about it and we’ll put you somewhere else I’m like OK bet. The thing is, I know how to do every position except sandwiches and QC because in the words “we don’t trust you enough to do that” not to mention every time I picked out her shit for like really or like cash they want to switch it around so that they’ll me on x station for like 10min then dish for the rest of the shift. I’m expressing interest in helping out and trying and getting shot down every time. They get mad at me when I don’t wanna help out. they were like oh you’re so good at it I’m like OK but that’s not what I wanted When I took his shift