Whilst I agree, generally (!!) with the comments made so far, there can be a fine line drawn between sycophantic la di da, and initiating a turf war. After all, what one person can accept as a gentle, humorous ribbing, another will take as heavy handed sarcasm.
I suppose the answers are either to know your correspondents, or be polite. Again politeness varies around the World, for instance, fortunately there is virtually no such thing as polite small talk in Australia, attempt it and you get accused of being a boring old person, or so I'm told. Whereas in England its possible to conduct an hour long conversation about the weather, and be none the wiser at conversations end.
cheers
Bill
ps Apparently "polite small talk" can be conducted for hours in Australia as long as its about the "footie", and even the definition of "footie" varies from State to State as there are four different types of game that qualify as "footie" (Australian Rules Footie, Rugby League "footie", Rugby Union "footie", and Football, whoops Soccer).
Edited By Bill Pudney on 16/02/2014 09:03:54