Disappointed I wasn’t wearing a thong

Guy I’ve been seeing and talking to, we’re kissing in my car, this was our 2nd hangout. He had his hand on my waist and gently slid it down to my jeans, he lightly pulls the waistband to the side, looks down and says “no thong?” in a disappointed tone. I didn’t even know what to make or say to that, except let out a nervous laugh and brushed it off, as it wasn’t something I was even expecting to come out his mouth? and no I’m not a prude in the slightest. I wear thongs all the time, just that day I wasn’t. Did bro think I was gonna take my pants off or be in a sexy matching pair for him? We’re still strangers. He’s 34. I don’t do anything sexual without a label.

EDIT: His hands were NEVER in my pants 🤦🏼‍♀️ I said he just pulled my waistband and looked down, that was it. Can we not shift blame on me due to his unexpected and bad behavior. Thanks!