Re: And the UK ?
The problem with that argument is that it's one of those superficially reasonable ones- that isn't.
Because this was a vote for whether the population wanted a change. Those who didn't vote, I agree they should have, weren't supporting a change. Especially since it was meant to be consultative vote. (The court actually ruled that it couldn't be overturned for that reason, despite the proven malpractice.)
In effect a relatively small group of motivated leavers who wanted this change prevailed over a significant majority who were part of either a slightly smaller group of motivated remainers or who just didn't particularly want a change, even if they didn't have a strong feeling either way, or didn't understand the argument (either way).
It's the reason why nations with a written constitution require a margin of, usually, two thirds for constitutional changes.(Whether we should have joined in the first place is also subject to that argument).