Relatively few people seem to know the difference between less and fewer, and in a sense I can understand that because the opposite is 'more', for quantity or number.

Much less excusable is the frequent mis-use of 'amount': I am fed up with the number of people who say the amount of people!

But of course the problem, as so often, lies at the feet of stupid and lazy teachers who have, for 30 or 40 years now, failed to educate children. Who decided that schools should be places for social engineering instead of for education?