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I don't follow.

LEGO is the singular and the plural form. Thus "a LEGO brick" and "the LEGO bricks" are valid sentences. That's why some choose to correct Americas on their use of "legos." It has nothing to do with trademark law.

Mainly I think it just sounds really grating to anyone outside America, as it's not used elsewhere. Similar to "I could care less".

I'm outside America, and I hear it all the time.

English-speaking country?

Ah, no. Portuguese.

I think its just grating for grammar nazis, rather than a legal issue. It's like saying sheeps.

That should be "it's just grating" ;-)

It's not quite the same as sheep/sheeps. Saying "there are 2 sheep in the field" is fine but saying "there are 2 Lego on the floor" still sounds a bit weird. You would have to use "there are 2 Lego bricks on the floor".

It's because Lego is an uncountable noun, like rice or sand. E.g. "there are 2 grains of rice on the floor" is fine but "there are 2 rice on the floor" is not. Saying "there are 2 rices on the floor" sounds very bad, and is the equivalent to using "Legos" instead of "Lego bricks".