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Folks, we seem to have a meta metta disease around these parts.
Mettā or maitrī means benevolence, loving-kindness, friendliness, amity, good will, and active interest in others. It is the first of the four sublime states and one of the ten pāramīs of the Theravāda school of Buddhism.
Mettā is a spiritual term that is a part of practice, making it a technical term on a forum about Buddhism. It's not a natural-language thing most of you grew up with (or else you wouldn't be a "new" Buddhist now would you?). I bet many (most?) of you don't say it when hanging out with friends or family. It's an "in" term for communities like this one.
Here's the problem. It's so easy to say or hear it as sanctimonious. It's a meta-description of what your words SHOULD be instead of what they ARE. I think using it in discussions where you're disagreeing with someone is dangerous and should be highly examined.
I've seen too many Buddhist communities where folks stab each other and then write "Metta" like that makes it OK. It's not. And I'd like us to step back from this idea that by writing "Metta" you're acting within in. If you want to embody Metta, it takes tremendous amount of effort to think about the various tones and ways each post could be made. To sign a post with "Metta" trivializes that effort and is certainly not the essence of it.
You don't look more Buddhist by writing "Much Metta", you look far far less. Be kind, don't wish for it.