Lux as support

I know its the meta n stuff but i mean, why the hell does every lux support go full ap without any support items? Its very very annoying lol. today i've countered a lux support who went full ap and my team lost. at the end of the game she said 'you're a loser supp and you suck' pls someone answer me lol are they just dumb or is it me.
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