It's a carefully choreographed act. This guy grew up at the top of British class society, he went to the poshest schools, he socialised with the richest and snobbyest people in Britain. He knows how to comb his hair and look serious if he wants to.

However he found out that by pretending to be an idiot he could look more folksy and harmless to voters. The act takes the edge of the seriousness of his psychotic politics which gives people an excuse to support him. Supporting racism and class hatred becomes easier when it's all just a joke presented by a clown.