Well, when they are statistics coming from the Pew Research Center, they definitely can’t be easily ignored. And perhaps all of the ancient foundations of world civilisation emanating largely from that ground could give reason for this sort of thinking.
However, what is truly astounding about these statistics is the 36% for France. That is definitely not something that jibes with my lived experience there (over a year of life, and not as a tourist but actually working there). It would be a real head-scratcher to imagine only a little more than 1 in 3 French people not believing that their culture is superior to others. I got lectured on that topic on a bi-weekly basis. I mean, the French being less self-confident about the superiority of their culture than the Irish? I would truly be interested in the timeframe of this survey.