I agree with the comment up the page- people don’t dislike cyclists because of anything we actually do, they dislike us and then they use things we do as an excuse for that dislike. ’twas ever thus.
That said, littering is just piss poor.
Doubtless 650B. Only somebody who has to have the latest thing regardless of whether or not there’s any benefit would discard a punctured tube rather than taking it home to repair.
Not likely- 650B tubes are so hard to find in the shops that anyone lucky enough to own one will never let it out of their sight.