The Yorkshire accent isn't different from all else. An accent in Yorkshire is part of a continuum of accents within Yorkshire and within the English language. Much of the south-east of England has had the local accents flattened out by the presence of London and it's this variety of English you'll usually hear in the media and which is regarded as 'standard'. Yorkshire's just far enough away from London that the difference in accent is hard to understand if you are unused to it. The same goes for the West Country, Black Country, Lancashire etc. You just need to learn to appreciate the variety of English in the UK.