I only did the shoulder touch once when leaning and tipping into an office doorway to hear our boss's orders but that was enough to establish 'proof' for my boss when I was accused. I did open doors and let people into the elevator ahead of me and I was polite which 'proved the case'.
We do live in a sadly debased world today because of both mal-mannered males AND power hungry females. We now have to walk through minefields where the most easily offended set the behavior bar.
Bingo !