Because English is the commonly used language for a lot of business and entertainment, many more people will speak English as a second language and they will generally be better at it than an English person who took Spanish in highschool or something. The big English speaking Western countries - Australia, Canada, UK, and United States - all tend to be very dominated by English, whereas many other countries are a lot more multilingual by default. It's not a universal, but it is a well known trend.