What really gets to me is the ones who decide which player or players they are going to blame. So for example Potts. Every mis placed pass, every mistake met with shouts and jeers. But the rather oddly a player they like let's say Williams for this example can do the same and is encouraged. Personally I expected this sort of season, and have said numerous times that if we stay up it's a bigger achievement than promotion. I'm not sure what some people expected.
It's more about self restraint than being a happy clapper. When you boo, you boo the whole team and that's unfair on the players that have had a half decent game. It's indiscriminate.
Might work for some players, but not all. For some it will further knock their confidence. They know when they've played badly. They don't need to hear a chorus of boos when they've been comprehensively beaten, to confirm that they were poor.
Players do not always know when they have played badly. So many times they claim to be unlucky or something similar after an abject performance. Its a way of saying we have standards at this football club and you must live up to those. As I've said, a way to motivate the players for next time.
You’ve singled out a number of players in the OP that would seemingly now have to contribute more throughout a match to win your approval as you’ve already set your stall out that they’re going to turn out a poor performance, therefore any mistakes made by those cited in the OP will be amplified whereas mistakes made by those of whom you harbour less ill feeling may go unnoticed or viewed in a different light.
Having a go at the team in anticipation of a bad result is the ultimate attention seek. What's up, couldn't you wait for 5pm on Saturday?
OK, so that's you being booed in isolation. What about the players? When you stand booing in the team's general direction at full time, how do the players know which ones you're booing? You've said yourself, you don't think they know they're having a bad game (despite only winning 5 from 21). There are always a few players in every team that have played better than the rest and don't deserve to be singled out, yet you standing up and bellowing like a big moose, just makes them feel as bad as the rest, and that's wrong. If you want to tell certain players or the manager what you think of them, get to the supporters meetings or tweet to them. Most are on Twitter. Making noises anonymously from a stand is the easy way. It solves nothing.