While my usual approach to this type of thing is “The Lion doesn’t concern itself with the opinions of the sheep”, I have to agree with you on this one. I read the chatter on some of those other servers (purely for entertainment purposes) and see that those players are as passionate about the game as any of us, so let them have their their way.
The only way that I know of is to have someone else let them know. I have an SG-mate that does this by accident quite regularly, so the issue comes up.
That all depends on what AT I am playing at the time:
Main: Trying to destroy my aggro control and my Regen rate by Nova-ing mobs to the four winds.
Rad/Fire: Absolutely HATING on the use of Burn.
Second Support: Apparently voting “No” on Fulcrum Shift buffs.
Same old, same old.