I think your language is a bit extreme - OK, so people whinge, but to label a whole group of people as "scum" because of it is going too far.
But yes, people are sore losers. Doesn't matter what class, doesn't even matter what sport or pursuit, people don't like to lose and some can't deal with the fact they were beaten by a better competitor. Therefore they prefer to accuse them of cheating.
Don't let one person's experience put you off a whole class, experience it for yourself first.