The racial slur of the day is Kaek.
It is used to refer to Indians.
Deep lore: Thais, living in Thailand, refer to the Indians (who have been in Thailand for at least 200 years, I think) as Kaeks, which means "guest" in Thai. Take a hint, already, guys! The word may also be spelled "kak" or any other way you like, since Thais use a different "alphabet." However, "kaek" is pronounced to rhyme with "crack."