You travel enough as most of us have and you understand that the majority of IO's are the same, I wouldn't worry, it's their opportunity to flex. I've just come back to England and the attitude of the coach driver is enough to U-turn. 😆 your back, just smile. Always ask for a supervisor as alot do not understand this visa or these new modern ways, most have never left or probably understand our attraction, to them it's just another day in paradise 😀