I'll bite.
I had the above ~80L potable water tank in my Tacoma when I drove from Vancouver to Death Valley this past April/May. We spent a few weeks on the road and refilled the tank two or three times. One time it was in a rest stop within a state/national park, which had potable water you could use to fill up. The other time it was a tiny, middle of nowhere town, just like the other tiny, middle of nowhere towns we had been passing (before and after) in that day. No water tap available anywhere that we could find, and the locals said that even if we found one, they wouldn't suggest drinking that water. So we went to the gas station and bought as much bottled water as we could, and used that. Some of it was in 1-gallon containers, some in 500ml bottles. All of the empties were recycled.
Bringing your own water in a water bottle is great, until that water runs out and you don't have a proper source to fill up. And what if you're traveling in parts of the world that don't have clean tap water? Plenty of such places in the US & Canada, not to mention Mexico and every country south of that.
I wouldn't immediately hate on someone with a plastic water bottle. What if that person is refilling that bottle, just as you're doing with your non-plastic one? I've done that many times, and there are times I still do, despite owning numerous stainless/aluminum water bottles.
I think people should take reasonable steps to not contribute unnecessary waste, but I don't agree with taking it to extremes, (such as "plastic bottle = bad") as that is a very slippery, and very long slope. If someone throws trash out on the ground, that's a problem. If someone chooses to drink from a plastic bottle, and then takes reasonable steps to correctly dispose of that bottle, I don't have a problem with that.