Marie,
I've read your note very carefully several times. It seems as if there's something here that you may not be telling us. You say that "it is an unpleasant experience" to partner this dancer. However, experienced dancers dance with unskilled newer dancers all the time. And I suspect that in your community, as in ours, there are some excellent dancers who pride themselves on being good partners to newcomers and helping them become acclimated to the dance. I've also seen dancers over the years acclimate themselves to dancing with people who have a number of physical or mental impairments. So I am guessing that there's something about this dancer beyond the physical impairment that makes him an unpleasant partner. Maybe one approach would be to try to address that, whatever it is, so that instead of having an unpleasant dancer with an impairment, you have a pleasant (or at least unobjectionable) dancer with an impairment.