I believe that by "the sound of those big bikes" the commenter does not know the bike characteristics other than by their sound, so it's the same either with a physically small or big bike: what he is stating is that he does not like the big sound.

That's true that there are big as well as small bikes with an horrendous sound, they are equally harmful.

I agree that they should very quickly belong to history (or museums). I wish that this new Yamaha concept will accelerate bikes electrification.