I wouldn't rule it out as a possibility, but for sure I might be a tad skeptical, and if I am completely honest, probably would pass. And if I were doing the instructing, I am sure I would be appropriately dressed for a professional training/presentation session, just like I would not wear flip flops to my meetings at work, or training/classes I am attending. Having said that, I do live in REEF (exclusively) flip flops when not at work (boots) during the summer! Around the property, fishing, my boat, hanging with friends, out with the wife. I wear them all the time and never feel at a disadvantage while carrying, which is all the time. I don't feel the need to always be dressed looking like I just stepped off a commercial for 5.11 to be tactically prepared. Now I will add this, FWIW...I would NEVER spend my summers in cheapo "Dollar General" issue flip flips. Those are just plain bad for your feet!