As humans, there is always subjectivity, even in things we declare objective. I'm willing to admit that :)
It's easy to pedantically point out I used 'opinion' in the same sentence as 'objective' but I'd hope you could apply 'the context of programming' to gather what I actually meant.
When we say 'objective' over matters of syntax I tend to think of 'If you put N programmers in a room they'd all agree this was better syntax'. That's how I feel about the above examples I posted.
That said I've edited my comment so I don't inflame other commenters to point out my glaring contradiction :)
This sentence reveals a deep misunderstand of either what "objectively" means.
(FWIW, I prefer the ES5/ES6 syntax to Python here, as well; I just don't mistake that preference for something other than subjective.)