I 10: Clutch “stinks” while driving backwards

Since 11.2015 we have an I 10 with 1.2L and 64 KW. With this Fzg. we have the following problem: If we rank the Fzg. and thus also drive backwards, the car smells burned afterwards. Very bad is the burnt smell, if we have driven with the car backwards a curb edge, which is regularly the case with us in front of the house. For me comes this smell from the clutch. My dealer says that he checked it and my findings ni I told him that the clutch would smell burnt in 4 out of 5 cases if we drove the car backwards up a curb. The dealer kept his opinion and assumed that it was our way of driving. Does any of you have similar experiences? What I don’t want to hear now is the statement “that it’s probably our way of driving”. That doesn’t get me any further. Both me and my wife have been driving a car for over 30 years, pr with no other car and underneath were several small cars of my wife, we had similar findings in the same place.