I do not intentionally take off from home in rain unless I am going to a motorcycle event and expect it to dry up. On the other hand, I refuse to be intimidated by "20 - 30% chance of rain." Far too many "Riders" put just a few miles on their bikes because they are so afraid of getting wet.
On those occasions when I had to ride home in the rain and the rainphobic have made a comment I just respond with "Anyone who never rides in the rain doesn't ride much," and let it go. On the other hand, I do not ride on ice and snow. Too hard to keep the rubber side down.