Constantly, and their attitudes have gradually mellowed during the year and a half I've been a Flashaholic.
I've found that there is one thing that silences the wisecracks and dampens the sarcasm. Power, raw power! A small light that is surprisingly, even shockingly bright and which throws a great distance has the power to convince and convert
When I enlisted some colleagues to help judge my "vertical throw tests" of the Tigerlight and M6 they were downright enthusiastic.
Unfortunately their appreciation for wonderful but less brilliant lights is a bit underdeveloped but I'm working on that. My "job" is to educate them so that they will pass on a more enLIGHTened attitude to their friends and family.
Sometimes I use unfair, below-the-belt tactics: "don't take this personally John, but frankly, any man who doesn't provide appropriate flashlights at home for the safety of his family is not being a responsible husband and father" ......you get the idea.
Brightnorm