I can quite understand how Brexiters, aware that the result in the referendum, in which the 38% of the electorate who voted for Brexit outnumbered the 34.7% who voted to remain, is not guaranteed to be repeated in another referendum, are firmly opposed to any such thing. I suspect that if the boot was on the other foot, the winners would want to hold the win.

But in neither case would it be honest to say that this was on account of any democratic principle, rather than as reflecting the human instinct to hold on to your gains. The refusal to admit that represents another very common human instinct, the one to be dishonest, to others, and also to ourselves.
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If in fact we wished even at this point to reverse our decision to leave the EU, it has in fact been made clear to us, for example by the Lennon quoting president of the European Council, that this would be perfectly possible. But even if "we" (meaning the British public) wanted to, we will not have that choice.

It's a matter of "you made your own bed - now you must lie on it". Though I imagine most of us prefer in real life to remake our bed, if we've done it wrong first time and it's not comfortable. The saying is absurd , when you think about it for an instant, like the one that says "you can't turn back the clock". Tosh. I do it every day.