C'mon. The thread judges the place and the people on what you imagine champagne to symbolise. It's not that different from laptops, cameras and smartphones, which are all acceptable to people here.
This thread is an argument about symbolism - absolutely - because there is no singular purpose / function to Champagne and posh cheese apart from the symbolic. The price dictates the pleasure, a pleasure derived from a sense of superiority. Apple laptops and suchlike are marketed the same way as champagne, and many can't afford any of this stuff, so I see how you have conflated the champagne with the computers.
However, the point about the phones and computers being different to Champers is that while they are all pitched as status objects, you can still apply for the job / phone the hospital / document the decline of your locality / Skype your long lost relatives with a bit of technology. Not so much with cheese. A phone and a computer are next on the list after 'basic essentials', and they have a use, while Champagne isn't on the list at all.
Now it's all a right old jolly laugh of course and nothing wrong with spunking one's hard-inherited cash and chowing down on hollow and purposeless status symbols and conversation pieces - but many many people are struggling with basic survival here so they would be justified to see C&F as a slap in the face. They might also see someone with a laptop and be envious too but the level of insult is completely different. There's a distinction between function (albeit expensive) and just mindlessly lording it up.
A concern I have with this thread is the convenient attempt to shut down debate (or just to have a lame pop at the editor) by suggesting that if you have a smartphone and a computer, you aren't poor 'enough' to comment or have an opinion. Irony being that if you were 'legit', you wouldn't have the kit to make a comment anyway.
C&F is a scapegoat because even if it didn't exist, the rents / house prices and gentrification would still be going on. Our government, our council, our Mayor, and a large enough number of old folk who vote endorse it all. In that sense C&F are simply an unfortunate side effect, so maybe we shouldn't wish them ill, or protest against them... or should we? Are these C&F people really salt-of-the-earth folk who just want to set up a little stall of wares, be part of the local community and earn an honest wage? Are they fuck. They don't give a fucking shit about Brixton, it's people, it's past, or it's future (unless any of that is commodifiable). They could have parachuted in to any part of London. There's no interest or loyalty. They are grasping, opportunist, empire building, jumped up, exploitative, Tory-boy pricks, flashing a v-sign at Brixton.
The scary bit is the lack of self-awareness. C&F seem confused and surprised by the reaction to their arrival. It goes to show that gentrification is propelled by people (from politicians, businesses and consumers) who really don't think things through.