Wow, as a parent with a pushchair (damn those kids for not being able to walk from birth!) and having owned a second hand bugaboo (brilliant for taking your kid out in the woods or countryside and cheap-ish secondhand) and not liking people dropping litter on the floor and thinking it's a bad thing, I read this thread with utter despair. I remember East Dulwich in the early 90's, do people really prefer it back then?
If parents/people who think dropping litter is a bad thing are not welcome in Forest Hill, then perhaps it will revert back to being full of empty boarded up shops and dodgy pubs.
I like a mix of stuff, cheap and cheerful and aspirational, where my hard earned money gets spent on something I really want. I don't see Forest Hill becoming a clone of East Dulwich, what does that mean?
If people don't like East Dulwich, then don't go there. I rather like it and do go there, as I do to Forest Hill, Crystal Palace etc.