The cold which had been threatening to burst at any moment has really clicked into gear, and I can no longer smell all that much. It's a myth (from my experience at least) to say that you can't smell anything when you have a cold, but the clarity of the olfactory perception is certainly much diminished at the moment.
I reckon I could still taste wine OK in my current impaired state (in terms of rough impressions), but I'd be less sure of my perception - that I was actually 'getting' the wine.
The fact that we think we are 'getting' the wine or not is one argument in favour of the idea that wine tasting is, at least in part, objective. There is something there, that is a property of the glass of wine we are drinking, that can be 'got'. Aside from inter-individual differences in perception, the assumption is that the characteristics of a wine - what it tastes like - are properties of that wine.
When I write a tasting note, I first write the name of the wine. Then I write under it the descriptive words - a selection of terms from my sadly rather impoverished vocabulary for tastes and smells - that best describe my perception of that wine. But all the time, the assumption is that the description I have given is of the wine. I am describing the wine, and my descriptive abilities (or lack of them) affect how accurately I carry out this task, but what I am describing is a wine that, if you were there tasting with me, you could experience for yourself. In this sense, the perception of the wine in question is not a private experience.
However, an argument could be made that what I am in fact describing is the interaction between me and the wine, and more specifically, a perceptual event occurring somewhere in my brain. In this sense, our potential for sharing this experience is dependent on us sharing: (1) taste and smell receptors that produce similar electrical activity for the brain to then process; (2) similar higher-level processing of this electrical information in the brain; and (3) similar experience (context) with which to review and further reflect on the perceptual experience (indeed, our experience may shape the perception itself).
It all gets very complicated, and the difficulty I have here in thinking about these issues is in trying to fit what I've learned with neuroscience into a sort of philisophical framework, without being too philosophically naive (which is something I'm prone to).