It is a matter of personal preference and as you have correctly pointed out, anyone that has issue with that is most likely immature.
That being said, I don't even bring a small water bottle on my rides anymore as they only average 60 - 100 minutes and when I first started I kept coming back with a full bottle.
It's not that I care at all about the extra weight or lack of.
I just don't use them and I do admit that I get a small amount of smug satisfaction when the occasional other dramatic riders question me about it after they notice my empty cage (which if I cared about weight I guess I would remove come to think of it lol)
Everybody's engine runs a little differently I guess and I have always been fine with some water before and after a workout.
To each his own