husband mentioned the size difference between him and the other guy TWICE casually post play and I want to die

we had a meet last weekend with another couple, dh and the other husband, me and the other wife (we do bi-friendly stuff). good night overall, everyone happy in the room. heres the thing tho. the next morning dh made an offhand comment about how the other guy was "kinda packing" and laughed it off. ok whatever I let it slide. then THREE DAYS later, totally unprompted, while we were just driving to the grocery store, he mentioned it AGAIN. same joke, slightly different wording, like "yeah Im never standing next to him in a locker room lol". he is laughing it off both times. hes not upset, or at least hes pretending not to be. but my brain has gone full investigator on this. is he secretly bothered. is he fishing for me to reassure him (in which case why fish twice, twice is a pattern). is he subtly worried I prefer the other guys size. did I do or say something during the meet that made him feel inadequate that he didnt mention. I have no idea what to do with this. if I bring it up directly I might be making a thing out of nothing. if I dont bring it up the size comment is gonna keep popping up for who knows how long. how do you handle a partner who keeps surfacing an insecurity through "jokes". do I just reassure proactively. do I ask him plainly. do I ignore.