Buddhadasa Bhikkhu metta description conflict with traditional mettā meditation

Question:

I'm a beginner and I'm studying (and trying to practice) both meditation on breathing and mettā meditation, and in the book Anapanasati by Buddhadasa Bhikkhu, which i'm following with some initial success, when dealing with preliminaries and false views, it is said:
"[...] Some forms of "radiating loving kindness" are phrased in an amusing way, for instance: "May I be happy, free from suffering hatred, difficulties, and troubles, and may I live in happiness!" This really reflects fear and self love on the part of the speaker. How could a person with such a weak mind ever put forth the effort necessary to realize impermanence, unsatisfactoriness, and non-selfhood? With this kind of ritual he will only disturb his mind all the more. [...]"
Now, i think almost every book and guide on mettā I've read suggests phrases like the one took as example in the above cited text. For example in Brahmavihara Dhama by Ven. Sayadaw it is suggested the phrase "May i be happy and free from misery" and similars. So the above mentioned paragraph confused me a bit. Do the Buddhadasa teachings conflict with traditional mettā practice? What view of things should a beginner follow, between these? Thanks in advance!

Answer:

Do the Buddhadasa teachings conflict with traditional mettā practice?

Yes, he did, because he is a unusually argumentative regard to commentary and abhidhamma. His quote is in visuddhimagga. So, he againt it.

What view of things should a beginner follow, between these?

The uneducated beginner should follow the traditional mettā practice, because it is easier to understand "what is mettā".
So in the path of purification, loving kindness meditation section, wrote:

when the practitioner doesn't know how to mettā, he should mettā to himself, before meditate mettā follow the tipitaka. "May I be happy, free from suffering hatred, difficulties, and troubles, and may I live in happiness!"

It is because the uneducated practitiner can easily notice giving-happiness-to-himself mind by this way. When he know what is mettā, then he can let the giving-happiness-to-the-others mind arise.