This myth is particularly pernicious in the area of taxes. The top 25% minus the top 1% earns half of all income. These people need to be taxed like upper income people, not middle class people. Confiscatory taxes on the "top 1%" (or people making $10,000,000 per year, or wherever the line keeps getting moved to) can't raise sufficient revenue to fund a modern welfare state.
In the U.K. and Germany, the 40%+ tax bracket (both countries have a top bracket of 42-45%) kicks in around $60-70,000 of individual income, or about double the median income. In Sweden and Denmark, the top tax brackets kick in around 1.5x the median income. The second highest tax bracket doesn't kick in until 6-7x the median income.
In Sweden, about 15% of people pay the highest marginal tax rate. If that was the case in the U.S., the top tax bracket would kick in above $120,000 household income. That makes total sense. These people are very well off and should be subsidizing the rest of the country.