Can't speak for the other countries, but the England players actually are political activists. They are heavily involved in social justice politics, have clashed with government ministers, wear clothing during matches with political messages, and make political statements on the pitch. Thats why people are angry about it. Because they are making themselves out to be hypocrites.

At the European Cup 2021 most players (especially Neuer, Goretzka and the whole DFB) suddenly were activists with a huuuge mouth and big words. THIS hypocracy is what many fans make angry

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