Make sure that your complaint raises the possibility that you were targeted because you are of a different race than the groper (assuming you are; in my part of the country, agents are grossly disproportionately a particular profile). If s/he treated others who were of the same race in a more professional manner, this should be brought up.

I don't know that it will do much good to complain, but it will give ammunition to a superior who wants to boot someone that otherwise might be difficult to get rid of.