Can't blame a guy for helping his client match the hatch. Assume they had a pellet fly on? It's not the worst thing in the world, but yeah, not what most reputable guides would do I would think. I also think it's possible (likely?) this was not a guide scenario, but just a guy teaching someone new to FFing. Does that make it any better? I dunno. Probably not, I guess. Not saying the guy wasn't a guide, but there's some assumptions being made in the OP that we don't know for certain the answers to.
FWIW, I'm not a big fan of guides in general. I hired one once in CO, to fish an area I wasn't very familiar with. When booking, I had asked for a remote, hike-in day of fishing small streams. I didn't really care what species, but I didn't want to see another angler, or fish water that was heavily pressured. We ended up fishing the popular, major river (still a relatively smallish stream) that runs along the major, paved road in the area. It was clearly heavily pressured and we ended up hopping sections a lot to avoid other anglers. I missed two fish on a hopper/dropper set up, and didn't land any, though by mid-morning I was frustrated with the guy and not in a very good, or patient mindset to do the kind of fishing he wanted me to.
Good (expensive) lesson learned, and admittedly, I'm probably not a very good client in the eyes of a guide. I had a certain kind of fishing in mind, and wasn't very open to experiencing what he sincerely I think believed was the best water in the area. He had asked I leave a review on their Google reviews or whatever. I decided since I equally was not a good client, as he was a guide, I'd just say nothing at all, as opposed to leaving a negative review. I'm sure there are many good guides out there, some of whom are members of this site, who listen to their client's interests and build a day of fishing to suit them. Still, I'll DIY, and gladly take a skunking on my own before I hire another guide.
