The remark about Corbyn being an "oik" reeks of snobbery because the majority of dictionary definitions refer to an implied link between class and loutishness:
"A rude and unpleasant man from a low social class" (Cambridge)
"An offensive way of referring to a person that you consider rude or stupid, especially a person of a lower social class" (Oxford)
"derogatory slang: A person regarded as inferior because ignorant, ill-educated or lower class" (Collins)
My own view is that there is plenty of loutish, anti-social behaviour displayed by those who don't consider themselves to be "oiks" and who in fact consider themselves to be vastly superior to the average person in the street.
The Bullingdon Boys are well known for their loutish and disrespectful behaviour. In Cornwall the police issued a warning to some of the country's top public schools - including Marlborough, Winchester, Eton and Harrow - that many resident complaints had been received about their pupils' behaviour. This included drunkeness, urinating in people's gardens, slashing car tyres, intimidating residents, drug use, etc. One young man responded: "I think people down here would suffer if it was not for the tourist trade and they can't have the best of everything".
And, by the way, I temped for a City solicitor who expressed to me the view that anybody who hadn't graduated from Oxbridge or equivalent was an "oik" whose c.v. should be consigned, unread, to the wastepaper bin. Apart from being unquestionably small-minded and elitist, to make such a statement to a temp who was highly unlikely to be an Oxbridge graduate is, I think, the height of rudeness.So, folks, unless you have had an Oxbridge education, or the right "connections", bear in mind that some people may categorise you as an "oik".
I have not seen Corbyn being rude or offensive or ridiculing or belittling anybody. He always seems perfectly polite and surprisingly good tempered for somebody who is constantly subjected to the sort of irrationality and pettiness that some have demonstrated on here.