Frowns and interrogative looks I guess. When someone does not act as the norm in situations you are expected to, people just reacts negatively, since reacting positively requires to question yourself and make a decision whether you endorse or not a behavior different than yours.
It's way more easier to dismiss self questioning and jump to the disapproval of non conform behavior, the one that everyone has already decided to follow (willfully or not).
I similarly find annoying those who realize this negative disapproval act of "non conform behavior" and try to do the opposite. TSA is a giant pain in the ass, let's do something about it to fix it and not worry too much about what its side effects are on people and what it's turning us into.
The standard head shakes of disapproval. Comments like "she should just go through the scanner like everyone else" or "look at her trying to create a problem".
After the first couple walked by and had such a reaction, I just ignored it. But then when it repeatedly happened, I wondered why so many people were bothered enough by her decision that they have to stop and make a snarky comment about it.
It could also be out of guilt. It is much more uncomfortable to see someone doing the right thing, when you know that you have chosen the wrong, and easier path. So you have to rationalize it verbally somehow.
