Airport security is a funny subject. As aircrew, we have to go through security every single day we go to work. I have refined it so that nothing I wear sets the detector off (belt, shoes etc). There is nothing in my bag that will cause a problem, and I put ALL my electronic devices into the tray And my liquids - in the allowed sized containers and in the correct sized bag. It is very simple really.
I am always polite and respectful to the staff. I smile and make polite eye contact. I say good morning/evening, do what they ask and say thank you when they pass me.
Sometimes I get a random search and pat down. Sometimes they ask me to take my shoes and belt off. Of course, no problem. Can I search your bag sir? Can I sample your liquids bag? Yes of course, whatever you need. It is very simple really.
Remember what security is trying to do - prevent an airborne fire, explosion or hijack. YOU know you are not a terrorist, but how do they know? You look like everyone else, so they have to check.
Security staff have an awful job. It must be so boring. Hundreds of times during their shift, they have to ask people to take their liquids out, take their belts off, take
everything out of their pockets etc, Add to that if passengers and aircrew get cross or impatient, and no wonder security staff are sometimes tight lipped or strict with people.
My advice is to pack remembering that you will need to remove all your liquids and electronic devices. Give yourself plenty of time to get through security - don’t leave it until the last minute, there might be big queues. Do not get angry even if you think you did what they asked. Be polite and thank the staff. They don’t make the rules, and it is a nuisance for everybody, but they are trying to keep you safe.
PS I am not having a go at you, Aihkio, my post is general advice to everyone.