[Scoundreller]

> would the speed and wind dillute the aerosol quickly enough to make it harmless?

Basically this. It's a probability thing though.

Indoors, air is stagnant and sneeze droplets can float around for a few hours.

Riding behind another cyclist requires poor luck for enough of their sneeze to impact you.

It's still cool enough for me to wear a face mask too, so that's another (hypothetical) risk reducer.

Plus, a cyclist is a good signal someone doesn't have active respiratory disease.