The "Beautiful Trauma" singer performed the US National Anthem despite battling the flu.
The troll had tweeted, "If I've said it once, I've said it 1000 times. Pink sucks and if you like her singing you're dumb."
However, Pink gave it back to the troll and tweeted, "Yeah but at least I suck while singing our countries national anthem, and you just suck by yourself on a dirty couch."
The 38-year-old star then thanked her fans for their prayers ahead of her performance.
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"It was a throat lozenge," she tweeted.
On the eve of her performance, Pink had said that she is suffering from flu.
"Trying to practise the flu away. I've been waiting to sing this song since 1991 when I saw my idol, Whitney Houston, own this song. And now, my chance has finally come," she had posted on Instagram.
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