I have flown into Savanahumbe and Don Muang from about 8 different countries and only ever asked once for an onward ticket and that was about 2014 in HCMC city.
On
*****
/24 I flew from HCMC to BBK and asked if the wanted to see my forward flight...response was..."No Sir, it is policy but we never ask for when you have a strong Pass Port. ".
An easy way is to buy a bus ticket to Cambodia it only a few $
That's classic...elitism...etc nit racism....dark skin equates to out door worker = lower wage= lower status = lower education etc...which is also wrong...but not racism...
racism does exist but the term is at times used incorrectly.
While living on Chiang Mai I often encountered individuals and families from no Thai background and they were generally wonderful and respectful to Thais.....then I woukd encounter a buscload of 40 people from the same country at a buffet lunch...shopping center...temple....Sunday Night Market...Doi Supep etc and their behaviour as rude and intimidating....that is not racism .. that's badly behaved people from certain countries.
Like wise the behaviour of some people from my own country is appalling but Thais did not discriminate against me because of that.
From living in Chiang Mai for many years the general population is very very accepting.
What they don't tolerate is people of any nationality that behave in culturally abusive ways and tgat has nothing to d with race or religion.
In CM there is a large expat community. Most are very integrated but tgere are others...especially those that call themselves economic refugees. They only live there because they can lead a life of ease compare to their own country. But they are super critical of they way things are done in Thailand, criticism the Monarchy, make no attempt at Thai language, live in enclaves etc.
I woukd be enraged also with any group who lived in my country and abused its laws legal or cultural.