Why do so many flight attendants freak out when I order whiskey on the rocks?

Question

They want to give me a mixer but I like my whiskey on the rocks or sometines neat

Update:

I also double-fist them

Answer 1

Because they hate to deal with drunks on the plane.

Answer 2

Well, it is flammable.

I suppose also they're afraid that you'll get drunk too fast.

Answer 3

Not used to nonsnowflakes flying the friendly skies.