The issue isn't about unvaccinated people using up hospital capacity per se, is about the possibility of the powers that be forcing a lockdown over them and whether the rest of us will adhere to it.
I've not seen any proposals to lock down over alcohol consumption as yet, so the issue for those of us who like a drink doesn't arise.
Of course, we were never really told why lockdown was called, so it's difficult to discuss measurables when we don't know what they were/are (albeit allegedly Boris has recently declared an "acceptable deaths" yardstick, which if true was a rather foolish thing to do because it's pretty much inevitable someone will find a measure which meets it, and then it becomes hard to resist lockdown calls).
But it we're reading between the lines and assuming the primary justification for lockdown is NHS capacity being exceeded, then I don't see why unvaccinated people should be the only thing under the spotlight.
I'm absolutely not advocating it as I'm not arguing for a lockdown based on NHS capacity (or any other reason at this point), but I find it hypocritical for people to be moaning about one group of people supposedly breaking the NHS, and therefore supposedly causing us all to go into lockdown, but not about other groups who have taken up NHS capacity not just in 2021, but over many years. One could extend this to say that anyone who hasn't controlled their weight, and is therefore more at risk of a bad Covid outcome, is "an idiot". None of this is a road we should be going down, instead we should be asking the politicians why the NHS has been found to be inadequate, and what they plan to do about it.
This government has absolutely relished in scapegoating different segments of the population at various times. Once upon a time it was all the fault of people not cancelling their Italian ski-trips (even though the government never told people to do so), then it was all the fault of people in Manchester (only after Burnham upset Boris), then it was people who don't wear a mask, now it's the unvaccinated. Who next?