Once in satasha while leveling my summoner I used LB at the last boss even though we had a melee dps.
He was so mad he told me to uninstall the game cause he didn't want ppl like me at lvl 50

And on topic, I usually type it sometimes in chat to remind the dps of the lb, but thats usually in low level dungeons where you don't know whether the dps are used to playing dps or not