Techs/vets giving themselves IV

Sorry if this isn't appropriate for the sub, but I've always been curious about this.

I used to work at an emergency hospital. The techs, as well as the vets, would often give each other iv's. They would always offer it to me anytime I complained of headaches or feeling down.

I would tell other people about this that work in the field and they just look at me shocked. Is this a normal thing that other practices do, or was mine just that weird?

Edit: thank you guys. I have concluded that yes, my practice was in fact, that weird. Your perspectives are really informative and I appreciate it. I thought that shit was mad weird, do not fret; i have an innate fear of needles. I said hell no every time lmao. But this was my first and only exposure in the field, I wasn't in a position to be questioning them at the time so I just minded my businesses.