Yeah but that doesn't mean we also don't dislike people from the US. It's a shock to many but there are Europeans who dislike both US politics and the average US citizen who flashes cash, doesn't learn the language, doesn't research where they're travelling, shouts all the times, spends 1 night per city, and is the kind of traveller in the article, etc etc.
Loudly proclaiming you're anti Trump is not a skip-the-line ticket to acceptance with us all. We also know a lot of people lie about their politics
I understand some people are jerks, but that also includes those who monolithize an entire class of people based on a stereotype.
The Americans traveling to Europe are usually not the Trump voters. There are exceptions of course.