Personally I use it for "I ate too much" too. Half the fun of emojis is the new unofficial uses that evolve (I wonder what the fruit peach folks' thoughts are).
I don't see the problem of including small groups - they are the ones who are most invisible and marginalized and therefore in need of recognition. You say it makes little sense, but to me it not only makes sense but is self-evident. Even if you're right, I can scroll through my emoji map and see many that are even more niche, yet none of them receive the angry flak GNC emoji do. (Not to even mention the even more obscure items in the rest of Unicode.)
I don't see the problem of including small groups - they are the ones who are most invisible and marginalized and therefore in need of recognition. You say it makes little sense, but to me it not only makes sense but is self-evident. Even if you're right, I can scroll through my emoji map and see many that are even more niche, yet none of them receive the angry flak GNC emoji do. (Not to even mention the even more obscure items in the rest of Unicode.)