It's founded on shaky grounds as you're painting the attitude of an entire country a certain way based on the fact that UK football's governing body refused to participate in world cups seventy or eighty years ago, along with some anecdotal evidence of Jamie Carragher calling La Liga a joke league (again, he's paid to have opinions that get people riled up, or at least talking). Surely you can see how nonsensical that is?
The history is interesting context but not the reason we're having this discussion. By now EPL fans have a reputation in other countries not because of what happened in the past but because of how they (and representatives of English football in whatever capacity) have conducted themselves. It's an internet meme already and most people who use it have no idea that the UK refused to take part in world cups because they thought it was below them. I didn't know it either but have to say, I wasn't surprised and had to chuckle a bit