In these days of mass low cost travel, and the availability of cheap credit the average IQ of both cabin crew and passengers isn't a s high as it once was. The result is that cabin crew are less able to give satisfactory answers to questions from passengers when something such as condensation appears from the punka louvres. Another result is that cabin crew are less able to describe, and communicate the observed symptoms of a problem in the cabin in a way that the pilots can understand. So you end up with passengers shouting at cabin crew because they can't make themselves understood, or banging on the flight deck door because they don't understand the answers that they are given.