To "suffer" from liberal guilt means that you are somewhat uneasy about all sorts of awkward things that it is tempting to harden your heart against, like global injustice, global warming, racism. It means that you are troubled by the stubborn persistence of our class system, though you personally have done fine by it. It means you sometimes worry that you might be prejudiced against all sorts of people. It means that your vague patriotism is laced with uncertainty about whether our ancient constitution is able to be truly inclusive. It means, for goodness sake, that you fail to be completely fatly smugly relaxed about this problematic world we inhabit. Is that really so shameful and wet, so laughably mentally effeminate?
If this little parade of privileged anxiety fills you with derision, then you are a Tory.