It might be worth examining the word “countries” there.

Both France and the Netherlands rejected the proposed EU Constitution by referendum in 2005. It was then regurgitated as the Lisbon Treaty (with only superficial changes) in 2007, which was ratified with no public vote.

The Irish people initially rejected both the EU-empowering treaties of Nice and Lisbon, and a followup vote was considered necessary. You get two bites of the democratic cherry if you have enough power.

A majority of the British people voted to leave in 2016, and in the three years that followed everything possible was done to reverse the decision.

You might be spotting here a difference in desires and power between the governors and the governed.