I’m from Europe and also got some French people putting me down for things in my culture that they made up whenever they felt like feeling superior.
It’s something that happens more than you think in France, and so yes not all French people but many foreigners will have experienced this attitude of superiority.
Your education system is over-corrective and hyper-critical and that produces people who over-correct and are hyper-critical of others. Bienvenue en France.
I don’t see anxiety in the writing, I see someone who sees clearly what’s happening in their own country, and the lies that people are told about how great it all is. Maybe OP is now questioning what’s behind the positive exterior of other countries.
Reducing social media won’t make her less woken up.