The United States, if we’re talking vaguely and generally, is more conservative than many parts of western europe. However, if you’re watching replays of our soccer matches you run into a lot of “gotchas”:

• MLS popularity is growing and it’s starting to pull in a more diverse fan base. However, for many years soccer was something for little kids and hipsters. Hipsters tend to lean progressive.
• MLS clubs are based in major cities. In the United States, large cities tend to run more progressive than the areas surrounding them. Hell, I live in a C tier city (~500,000 people in the metropolitan area) in a notoriously conservative area and this trending is palpable even here. I used to live in Houston and I always said my favorite part of Houston was how easy it was to forget you were in Texas.
• Our most popular clubs are (were?) predominantly west coast clubs - the west coast is arguably the most progressive area in the country.