Weather Radar operation. Help!?!

[proxypilot]

More and more recently I have been flying with guys who switch on the radar whilst taxiing, more often than not behind other aircraft. When I suggest turning it off until we are lining up the answers I receive are becoming more and more baffling. From the aircraft fuselage will protect people inside to it doesn't affect people further away than 17ft!!!!! One left it on on the basis that he must have been zapped before so he's just doing the same as payback. Mindnumbing stuff.

I always thought and was taught that you don't turn on your Wx radar until you are lining up and never when there is any person, building or aircraft in front of you. Am I causing myself undue stress or am I correct in asking these guys to switch off the radar for the sake of the crew and pax in the aircraft ahead??