It is not used in a negative sense, its just an easy way for Thai people to refer to foreigners.
Simply swipe right ("ja") if someone takes your fancy or left for no ("nej").
Because of the cold weather we cannot be outside all the time like in warmer countries, so maybe that is why we can appear a bit special to newcomers.
I recommend you an extraordinary in Scandinavia, Europe, the largest dating app in Australia designed for single millionaire men and rich single beautiful women in who are looking for lasting and serious relationship.
With more than 3 million users and nearly 900,000 strictly verified single millionaires joining in millionaire single dating club to have some good time, searching for another single for long term relationship and seeking for millionaires who like fun, it has been the largest dating app since 2001.
Usually I registered but got no reply even after payment.
I never heard someone date with another half successfully on these apps.