Speaking about Americans only, the right wing people in Thailand are typically from the fly over red states where they tend to be lower educated and therefore make less money. So they can't afford it like the more affluent liberals who live in states with a higher income.
I think most of the lefties referred to by the OP are not from the US but are more critical of the right as they can't believe they're so stupid they've been sucked in by the lifetime orange grifter.