Something that does bother me is people mixing their units. I have even seen cycling magazines doing it e.g. "A hilly 50 mile bike route with 1,750 metres of climbing"...
That might be an age thing. Im in my 50s and can work interchangeably in either because I was taught both in school. I can do rough, but pretty close, conversions, from one to another with barely any thought.
Thats why I don't understand it when people complain imperial measurements are difficult. They're only difficult if youve not been taught them - after all, you'd find speaking Spanish difficult if youd never been taught it and lived with it, so a commentator blaming the system for a lack of their own knowledge and education is a bit daft. I know bugger all about molecular biology, but the failing there is mine and not the subject matter.
All joking asaide, as a practical matter I'm completely happy and comfortable using either and have no preference. Being English by birth and Scottish by the grace of God I would always say imperial, but in reality if I awoke tomorrow to find one or the other had disappeared from the face of the Earth it would cause me little angst.