No it is not. And most certainly it is not at all near or in Phuket.
To make it clear: I myself am not expat, just come here in TH every yr when its winter @home (EUR) and also ´winter=cool season, not too hot, here in TH.
Out of interest and also as a kind of relic of former work I follow also other forums set up by such groups. Mostly of course those in own language.
1.it should be obviously clear that most are centered in their own country/language, and USA are by far not the most populous such groups. It would also help if you could state yours.
2.it should even be more blindingly clear that str8 relations far outnumber gay ones. The archetypical elder, fat, in pension farang maintaining a Thai wife, perhaps a former bargirl, perhaps a kind of also economic relation: a moreor less helpless men in things for doing the house and a Thai wife who is used to being caring, and cleaning/cooking/washing/etc. As such not really much different from how in former times marriages in the west also held form.
3.due to where most of these ladies come from and if the couple decides to stay in TH and not homeland of man, its Isan, Isan and Isan as #1,2,3 and then some other areas, North, BKK-city and far fewer in the south. And spread out all over in even the tiniest of small villages (like baan nok khee ma= village birdshit, as these are commonly known). The wife or her family owns the land-title, the man brings in the money (a few 10.000€ or $ or GBP is enough) to build a decent house on it.
In fact as I remember TH is among the 3 countries which has in % most of these spread-out mixed couples in the whole world.
Now IF they also cluster together or have other binds will differ enormously. There are no fixed and stated rules for that either. Nor even really any clusters of like : the Swedes live there, The Germans here, etc.
THat is how far my knowledge runs.