At the grammar kids get amazing facilities, can do 3 foreign languages, Latin, lots of extra curricular, after school clubs, debate teams, public speaking etc
This isn't the case in my experience, our local grammars are desperately under funded & the amount per pupil is lower than the secondary moderns. I reckon this is one reason the Tories like them, it is cheaper.
Anyway, that wasn't really the point of your post.
I went to grammar at DS is currently at grammar but I still don't agree with them, we went because they exist in the area we live in. Surely the right answer is for fab comprehensives to exist where everyone can be in the right group for every subject, you can have strong and weak subjects & find the right level for everything. And kids didn't need to travel by bus/train for hours a day.
I would be offended if someone said to me what was said to you. But many grammar parents are very defensive because they are terrified that if it changed, their children would get worse exam results.