Set AITA for asking the AD to see the insurance certificate?

Before a stunt-heavy indie shoot, I asked the AD if I could see the production's insurance certificate. Not because anything seemed wrong — just because the script had a car scene, a fight scene, and a fall, and I wanted to know I was covered if something went sideways. The AD laughed and said "you're not union, we don't do that." I pushed back politely and said I'd feel more comfortable seeing it before we started the stunt work. He eventually showed me a certificate on his phone. It was valid. Everything was fine. But after that, a couple crew members made comments about me being "difficult" and the stunt coordinator (who was also the director's friend, not a professional) seemed annoyed that I'd questioned the setup. The shoot itself went fine. No injuries. But I can't shake the feeling that asking a basic safety question cost me social capital on that set. Is asking to see insurance really that out of line for non-union work?