So Right – so wrong.
To the genreal frum public at large: Only a bulvan would seek to use the Torah, the paradigm of menschlechkeit between odom and chaveiro, as an excuse to avoid acting like a mensch. A door should always be opened for a lady. My husband still does that for me after 34 years, and my kids do the same. I likewise hold the door for him, when the situation warrants (like if I am already there at the door and he is coming up the walk). Simple courtesy is NEVER, repeat NEVER against the Torah. People have to stop trying to use Tznius as an excuse for their boorish behavior. EVERYTHING can be done in a tzniusdig manner, if your intention is to actually be tzniusdig, and not mnerely to use tznius as an avoidance of good manners.