I'm going to say this: as a resident of Malaysia, this "Malay-Chinese" faggot will be roundly mocked if he ever stepped back into Malaysia. Kindly fuck off and never return.
That said, I found his story mildly believable. Malaysia has a known brain drain problem for years, if not decades, with the richer Chinese minority moving abroad to settle in Anglo lands like the US, Australia and New Zealand. Very possibly, he's a second-generation immigrant from Malaysia at some point, probably in the 80-90s when American green cards were still easily available.
And yes, Malaysia still has sodomy laws in their books, and you CAN get jailed for fucking ass. However, this law has only been selectively enforced, and usually against anti-government figures.
Malaysia is considered moderate by Muslim country standards, but the religion itself has been a political football that gets trotted out whenever the government needs to shore up its support. The vast majority of the Malay majority is conservative and religious (though trending towards more moderate/liberal lately).