I mean of course there's a subset of heterosexual young men who weigh women high in their travel decisions, and that's across every ethnicity for almost every region of the world, not just SE Asia. Pick a country. There will be a reputation there, of one or a few ethnicities or nationalities having privileged status in the dating pool. North American gringos -> South America; French guys -> American girls; White guys -> Japanese girls; Argentinians, British guys, etc., etc.
Of course girls is a factor for some. And then of course it's hardly a factor at all for many others who, SEA in particular, want cheap living, beautiful nature, safety, super polite and humble population, and escape from Western first world social practices, people, egos, politics they don't like.
If you're trying to chalk everything up to a single thing, you're showing a limited mind.
Edit - hijacking my own comment, after insulting religious institutions on the Muzzmatch thread, I appear to now be defaulted to the bottom of comment threads, despite upvotes. That's happened to all my comments since then, when they used to be defaulted at top and usually hung around there. Hopefully it's temporary... ? Am I going to need a new account/ VPN ?
Edit2 - yep, blocked from posting ('too much posting', well over an hour after last post). Farewell HN. Orthogonal out.