Wearing Gloves When Taking Vital Signs?

I was wondering what is considered the norm in different people's ERs when taking vital signs about whether nurses/techs wear gloves. Whenever I have been to the ER the person who does my vitals on admission never wears gloves but several times when the techs have come in to take my vitals (no body fluids expsoure possible) they have put on gloves. As you would expect, at the doctors office they don't wear gloves either for taking vitals. When I have asked why they need to wear gloves to take my BP the responses I have received are "I don't know why you are here, so it is a standard measure" and "You don't know what I might have" (meaning the tech)-if I have to worry about catching something from the tech, she shouldn't be working. I understand the role of PPE and am all for it but I also was taught that a basic exam you don't need gloves that it is good for the patient to have human touch without a gloves barrier.