Working class culture, or rather the cultural aspects which you seem to have cherry-picked, is just one aspect of many which we can discuss. Guardian readers are also generally opposed to wars which increase the suffering in the world and are opposed to poverty, inequality and the policies which lead to them. They're also known for standing up for oppressed people and are more likely to speak out against the suffering of other sentient beings too.
Thus, the act of liking or disliking the culture of a group is largely irrelevant to opposing the suffering inflicted upon them. The tactic of the appeal to hypocrisy - fallacious, by the way - is often employed by right-wingers, who often hold and same views and justify the cruel policies inflicted on the working class, for example. I'd rather stand up for people while disliking their culture rather than disliking their culture and rationalising their suffering. (I, personally, as someone who reads the Guardian as one of my sources of news, don't think that I particularly 'patently hate working class culture', as the original poster puts it.)
And, as someone else has pointed out, disliking a culture or belief is not at all equivalent to disliking the people. Otherwise, I'd dislike all religious people and all meat-eaters on a personal basis, which I most certainly do not. Disliking a culture is not equivalent to disregarding the interests of people within that culture: the interests of all sentient beings should be considered on an equal basis.