Was about to update my above comment, exportRender:false also doesn't work. I am applying this to a detail grid on the icon type:"deatil" column
Even exportRender:function(ui){return false;} does not work
I tried skipExport:true which works obviously, however this column is the first column and is frozen which causes the next column to be frozen, or in the case of my grid the 3rd column as the first two are frozen