Is this a real question? They have higher food standards, regulation, and inspection regime than the US does itself. Other countries are a mishmash, but I'd imagine at least Canada/Australia/UK/etc would meet or exceed the bar too.
Europe has different standards. I don't believe you can say that we have higher standards since IMO that claim would require every component of our standards to be objectively higher. But standards can have different effects in different places. Witness for example the fact that unwashed (high grade) eggs are banned in the US whereas washed (high grade) eggs are banned in the EU, but both of these bans are based on local conditions. US authorities believe that washing is necessitated by conditions on US farms, whereas EU authorities believe that washing eggs damages the protective coating of eggs. Both authorities believe that the opposite regulation would be the worse option in their respective situations, hence the status quo.
Is that really true? Unless I'm missing something, American food standards and regulations are usually just as good as europe/canada/UK's , if not better. If anything I'm a bit puzzled by your claim, considering just how many food related scandals europe has had in the past few decades. Fake olive oil, horse meat, poison tainted wine, mad cow disease... and that's not even getting into the mishmash of "cultural/local exceptions" to food regulations (which are a good thing, but still undermine your point!).
But maybe I'm wrong, it's just that I've never heard any expert or anyone else really claim that the USDA/FDA are too lenient, more so than their europeans/CANZUK counterparts. It's usually the opposite actually!
Europe generally has much more regulation than the US, not just in food, but in all areas of life. In addition to individual counties having on average more complex regulation, the EU's main purpose is to set regulation standards between member states.
Also, from a cultural angle, food tradition is more deeply ingrained and there is much more skepticism of GMO and food products. American food has a reputation of being fake/candy.
Interestingly, the UK seems to be far more on the US's page when it comes to food and it was a component of Brexit that they wanted to right to race to the bottom on their food products.
