For a devotee there is no caste, because he's servant of God. He does not belong to any material consciousness. This is Kṛṣṇa consciousness. This is transcendental. Sa guṇān samatītyaitān brahma-bhūyāya kalpate (BG 14.26). In the Bhagavad-gītā it is said that one who is engaged in the service of the Lord, he is on the platform of becoming Brahman. Brahma-bhūyāya kalpate.
Sa guṇān samatītyaitān . . . guṇān means this world, this material world, is full of three qualities—the quality of goodness, the quality of passion, the quality of ignorance. Or mixed: three into three into nine; nine into nine equal to eighty-one. There are so many mixture of qualities and different kinds of men, because they are within the material qualities. But as soon as you engage yourself in the transcendental loving service of the Lord, you are no more within these quality; therefore you are freed from designation.
Just like these boys, they are not thinking that they are American. I am not thinking, "I am not Indian . . ." "I am Indian." Actually, our platform is Kṛṣṇa. We are loving each other. So we have forgotten our designation. Otherwise, how they can work so nicely? Sarvopādhi-vinirmuktam (CC Madhya 19.170). They are now thinking in terms of Kṛṣṇa, that's all. Similarly, if this consciousness is spread, so simple, then they will lose designation, there will be no more distinction, "Oh, I am Chinese," "I am Russian," "I am American," "I am Indian," "I am this," "I am that."