I hadn't noticed your post until it got quoted above,
Nanker Phelge , but I'm a bit surprised at it tbh. You generally come across as a fairly balanced poster, and I would not expect you being sympathetic in any measure to the attitude you describe. I'm not talking about hostility towards gentrification, and not even towards Pop. But the prejudice towards those who visit, or indeed towards anyone who just 'looks wrong' it is well dodgy IMO.
I happened to briefly visit Pop on Saturday at lunchtime. I didn't think much of it or its atmosphere as it happens, but I did pay a bit of attention to the patrons (something I would never normally do) with this thread in mind. All I saw was normal human beings. Some races and fashion styles were certainly more prominent than others, but that was about it. The patrons I saw were about as guilty of the social ills affecting Brixton and society as a whole as my cats, and condoning any kind of hostility or finger pointing towards anyone because of their looks is an unhealthy attitude.