That beer map is a crock of sh1te, a bottle of beer was at least $5 in Canada when I lived there 8-10 years ago, and was more expensive in the big cities of Vancouver and Toronto. Its undoubtedly gotten more expensive since.
A bottle of Chang in thailand is anywhere between 40-100baht, which is less than $3
And I very much doubt beer in China is more expensive than Japan or the UK, Unless they are only counting parts of Shanghai.
Beijing (the city surveyed) is not a cheap city any more. If you're buying foreign label beer, that price is about right.