This would be irritating for sure! It is one of my pet peeves to say the least when anyone tries to go over my authority with my own dog. It reminds me of one day that I had my first Dobe in an obedience trial in Tucson. It was hot and sunny. We were next to go into the ring, so I had my boy at a heel. He was extremely well trained, but hated the obedience ring – stressed out, which stressed me out greatly. We didn't like anyone or any experience to mess with us. We had a routine (which yes, in the later stages of going for our titles, included me brushing his teeth as we sat and waited for our time to approach – so, I could have probably been seen as one of those dog weirdos that Rubie talked about

) But back to this day in the desert sun as we waited, next in line to go into the ring: Up walks a woman with a bowl of water and she offers it to my Dobe. She was just going to foist the water upon my dog without asking me. Clearly she, and probably her friends, disagreed with me having my Dobe out in the sun as we waited, instead of in the shade. That ticked me off so bad, I tell ya.
Anyway, I'm curious how you knew these folks were dog show people? Again, it was totally inappropriate, weird and rude for them to place hands on your Dobe. Standing there and judging your Dobe would have been bad enough.
I'm also reminded of, with my current Dobe, Oji he was still pretty young and I walked him to the pet store to buy food. There was this, also young, Dobe that was clearly from conformation (show) lines. It was much larger, more filled out and more impressive looking than my working Doberman. I didn't get any real direct interaction with the fancy car driving man who owned the Dobe, but I did feel his eyes upon us, and I just knew that he was thinking I had a scrappy meager excuse for a Doberman. Truth is, though, my Dobe without a doubt was way stronger, faster, could bite better and more close to what a Dobermann was actually meant to be than his was.
Yes, people are weird about dogs.