Depends. I currently attend one of the many grammar schools in Southend, and being in Essex and not hugely bourgeois lol, there's honestly little elitism whatsoever. The schools attracts a lot of people from East London and nearby areas, and not many people are loaded, the majority are decidedly middle class, but the amount of working class people outweighs the amount of richer people easily, I know few "posh" people. The years 7 and 8 in our school are the first years where there's actually a non-white majority. Honestly grammar schools in the right area a great thing. Our school is elitist in we think we are better than state schools, but that's because we consistently perform well nationally. The only difference I've noticed is that there are way more smart people (obviously), and the same stereotypes in comprehensives, same sorts of people, nerds, sporty people, "cool kids" etc, a lot more of them take pride in their grades. It's only the bottom 30 or so who care little about school and don't do that well, but to some extent, everyone has a pretty alright work ethic. But yeah, I honestly depends it is dependent on where your grammar school is.