I gained safe passage past a pair on Sunday. On a very quiet narrow road near well-known racehorsey property.
I did the usual hello stuff as I approached from behind, slowing right down (they were 2-abreast, the rebels!). After some delay they singled out (one looking rather frisky). I cautiously passed them, talking. It was only as I was almost level, and I asked if they were Ok [meaning with bikes], that either rider said anything to me. She barely turned her head. 1 horse still looking frisky.
So although there was no problem, I felt they could have helped things a lot by actually acknowledging my presence, or maybe even waving me past. Clearly racehorses, so I was far more on edge than with "leisure" riders.