Is Southeast Asia (i.e, Burma, Cambodia, Indonesia) a land of Mlecchas?

I ask this because, while I'm not Asian myself, in my extensive travels I've noticed a lot of behaviour that is concurrent with keeping with the Vedas, i.e, Burmese don't eat beef and worship the Gods every day even as they claim to be Buddhist; Khmer from Cambodia and even most of Indonesia were Hindu (and the educated even spoke Sanskrit) for most of their history until mass conversion, and even today still worship the gods (even the Muslims of Indonesia), just many that are relatively obscure in India and the rest of the world today, i.e, Sri Harihara is the most popular god in Cambodia today, Dewi Sri is the most popular goddess in Indonesia, etc.

Would these lands be considered as Mleccha lands, or not?

P.S: A sort of aside question, but would Ancient Ireland be a Mleccha society even if they had a taboo against beef well until the British begun their campaign?