They control your life.
Your drink, if its messed up, can ruin your day. On the flip side, when made correctly, can warrant in a tip.
Why however do they question things?
I happen to always ask for my drinks "Extra Hot", since they are using cold milk, and that can leave the drink cold if not heated up enough.
The other reason I ask for "Extra Hot" is that I may not drink it for 20 minutes, and like this it is still hot when I get to it.
So when it was 90 degrees outside, I heard one Barista say to the other "Who gets their drink extra hot in this weather?"
$20's says she drinks Iced Coffee during a blizzard and doesn't think twice about it.