I like to use decrease b/o on the cuffs of 2x2 ribbed socks, "in pattern" to match the ribbing. I think it looks better than either tubular b/o for double rib or chain b/o in pattern. It's quite stretchy too.
There is no right way to knit; there is no wrong way to knit. So if anybody kindly tells you that what you are doing is "wrong," don't take umbrage; they mean well. Smile submissively, and listen, keeping your disagreement on an entirely mental level. They may be right, in this particular case, and even if not, they may drop off pieces of information which will come in very handy if you file them away carefully in your brain for future reference. ~Elizabeth Zimmerman