Some years ago there was an excessively stupid Labour MP who gave the lie to Boris' pronouncement yesterday that "Some people are just too stupid to get on in life". Anyway, on the subject of enforced equality this prize Labour twit announced that he wanted all 11 year-olds to reach the average reading standard for 11 year-olds. Boris probably avoided making reference to the 'below average' because the world is full of twits who imagine that this means something mildly insulting rather than being a statistical descriptor.
In context, it's quite clear that Boris was speaking in terms of a statistical distribution; "Whatever you may think of the value of IQ tests, it is surely relevant to a conversation about equality that as many as 16 per cent of our species have an IQ below 85, while about 2 per cent have an IQ above 130". Of course, it's not just IQ; Eton's lower forms are filled with boys with IQs of under 85 from hereditarily stupid but wealthy families, but generally they leave at 16 to work on the family farms (with ten GCSEs never to be used again).
But yes. The world is made up of the below average and the above average, and any attempt at enforcing an equality of state between them is simply to either waste resources or ban excellence.