Yeah, self-centered sound dudes. I got tired of the same issues at this popular outdoor venue. I asked the soundman, during a break, why is he mixing my level to the point of inaudibility with the crowd. He told me this. I don't like keyboards that "get in the way"; rock is about guitars & drums. So, for the next set I turned my volume completely off and mimed it for one song (band mates indulged me).
After that he comes on stage and told me to bring up my volume cause he can't hear me. I told him neither can the audience, so he better make sure they hear me from now on. And, he made the adjustment! My ploy worked and the crowd could now hear me for the rest of the night.