My point was that over the years, I have taught in 'bog standard' ('ordinary or basic') state schools (in other words, schools that aren't filled with high-achievers or non-achievers).
I think you are being a touch disingenuous.
Your original post talked about 'bog-standard comprehensive schools
with no ties to the local religious groups' (my emphasis). So you were very clearly restricting your criticism to non faith schools - if not why on earth would it be relevant to tell us that they didn't have ties to religious groups. And given the nature of this thread (and this is on the Christian Topic) then the discussion is necessarily linked to faith schools.
And previously you had asserted that it didn't matter if faith schools were very narrow in their demographics (race/religion) as kids socialised with all sorts of people outside school. By the way I don't think this is true in many cases.
So it isn't unreasonable to put together your various assertions in the manner I did.
Nonetheless, lets see whether you are able to agree with the following points:
1. That factionalism (racial/religious) does occur in some schools (but certainly not all) and is found in faith schools as well as non faith.
2. That there are plenty of schools with very mixed intakes (in terms of religion or lack thereof and race) where there are no problems with factionalism along those grounds.
3. That if there is a problem with factionalism the answer is not to 'segregate' those factions (religious groups/racial groups) into different schools.