Well I don't know what your teenage years were like but mine were very much full of my opinion on things. Some of which I now look back on and think how on earth could I have believed in that - but that's part of maturing.
As for children being taught to respect their elders - I was taught to respect everyone. Didn't mean those people were right, just that I should respect where they were coming from. But I could, and did, tell them if I thought they were wrong - after all they were telling me the same thing. It's called dialogue.
I remember taking part in a protest in the mid 70s on a boat on the Thames taking a petition to parliament. Our local council were planning on closing our school and we were having none of it. So the children (backed by the teachers) organised a petition and we spent months talking at council meetings, going to the newspapers then organising a boat with the help of one of the dads, to get some publicity. The school is still standing - thanks to us kids (I was 13 at the time).
The boys in our class, when we were probably 15/16 years old, decided to wear skirts into school for the day in protest that the girls couldn't wear trousers - even in the winter - in those days. One of the boys had re-read the uniform code and realised, while it said girls could not wear trousers, it didn't say boys couldn't wear skirts. So he organised the boys who borrowed skirts from us girls and in they paraded. The headmaster conceded that the school couldn't stop them and the following year the code was changed to trousers for all if they wanted them.
My cousin, who is 10 years older than me, took part in ban the bomb protests at 16. Another sat in the road to stop developers taking over land.
It's part of growing up.
As for the kids telling us what to do but not contributing. That's what discussions and rows between kids and parents are for. I support the environmental movement BUT I have talked with DS (who is 14) about the fact that the computers they all have for school, the mobile phones, the PS4/XBoxes they all love are all plastic. All by products of the 'dirty oil business'. I've spoken to him about the fact that wind turbines have to use 'dirty fuel' to be made in the first place (at least until wind power is strong enough to make enough fuel to work with). He wants to go into environmental engineering - working on green energy etc., but understanding that, at the moment, we rely on 'dirty' fuel for so many things has made him think about ways that could change. Dialogue is everything and you don't get that by 'only speaking when you're spoken to'.
Of course some of the things the kids find important make some adults shake their heads. My mum shook her head at Greenham Common. Her mum shook her head at equal rights demonstrations as she was perfectly happy in her world. My mum wasn't though - she wanted the same pay for the job she did. It's how the world changes.