I'm yet to be quizzed on whether I should be in a line or not...

Can't say it's because of my dashingly attractive looks <lol>. Nor the way I dress (although I do try and look neat on J or overseas flights particularly)

When about to check in, FF Card and passport are ready to hand across. I'm also ready to say I'm OneWorld Emerald if they posed a question like that.

One thing to keep in mind. A smart*(^ answer back to the Check-in agent might feel good, but they do have some power over your flight experience. That could include getting an upgrade denied, allowing you that extra 2Kg of luggage without charge or putting some kind of comment on the flight manifest...