Ignore it, as I put him on that function here.
Nothing but the tire kicker, crap stirrer looking at your for sale car at a show, picking everything apart and no answer will suffice.
Or the two year old after every answer you provide asking, WHY???
You answered, have a policy and procedure in place to address the shipping quote... don't pay attention to this Karen. Was in retail for years, still am with electrical harnesses/battery cables, and some people you just can't satisfy even with solid answers. I feel your pain!