Most just think we are mad ad don't understand.
I have had very few really negative comments- or ones meant that way
Worst was perhaps on turning 40 "so are you going to grow up and stop all tis daft running in the mountain and mud now" (I do hope not!!!)

Best was 2 years ago on Calderdale Hike- man came out of house/ pub and tried to run with me, after 50m asked how far I had run. When I said about 36 miles he stopped dead and said F*** me (no thanks , he was a lard ball) But at least he was impressed.