Yes, exactly.
We have to be careful not to treat security as second class citizens. They probably hate their job as much as we hate the necessity of it.
By being pleasant to security; saying 'morning and thank you, and being generally polite and compliant, maybe a little bit of self-deprecating banter; security will gradually relax and realise that aircrew are nice people (generally).
Even, as you say, on that odd day when your bag has to go through several times.
Had this guy worn his ID around his neck or on his shirt, as we are supposed to do; security wouldn't have had to keep asking to see it and everything kicking off.
Don't get annoyed, don't question them, don't tell them their job or start getting arsey or tutting, sighing or getting an attitude.
Just remember - we are going out to fly a modern multi-million Euro aircraft, they are not, so there is no need to rub their noses in it. Just be nice and respectful.