Some people are thoughtless, some people lack understanding or empathy, some are judgemental, some people are just arseholes. I think alcoholism is generally recognised as a disease now by most people, and if you recognise it as a disease, you're generally more inclined to have a bit of sympathy. Fat people though - we're just greedy lazy fuckers. But there will always be the people smug in their own perfection and self-discipline who can't understand that other people find some things difficult that they find easy, and who are more forthcoming with the judgement than with the kindness.