"I live in a part of Bangkok where I may not see another Westerner for six months or so."
"Hard to imagine that is possible unless you live at the end of a dead end Soi and never leave the area around the house. "
I can easily imagine it.
I live in an eastern suburb of Bangkok with essentially no tourist attractions.
I rarely see any westerners although I don't count the days.
My workplace is next door to a TOPS market and TOPS is usually popular with westerners, but I rarely see any farangs.
Although, I do occasionally see farangs, if I saw 2 in a day that would be exceptional.
I used to live in Ratchayotin and same thing, could go days without seeing a westerner.
Bangkok has a lot of neighborhoods where you won't see many westerners.