Kate McCue, the first American woman to captain a mega cruise ship clapped back at a social media troll with a grammar lesson.

The 42-year-old captain for Celebrity Cruises responded to a now-deleted TikTok account that sent a “sexist” message that read: "How can you be a captain? Your[sic] only a woman."

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"Normally as I'm scrolling through comments and see something like this, I totally ignore it and move on with my life,” McCue started in her video response, which she posted on Saturday. "But, I think it's about high time that I address this, because it's 2020, and in this day and age I'm shocked that someone still doesn't know the difference between 'you're' and 'your.'"

"So, just a quick reference: 'you're,' as in 'you are,' as in 'you are sexist,'” she continued confidently in her captain uniform. "'Your' is something possessive, it belongs to you. Like 'your ignorance.'"

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"But, don't worry, I'm here for you," McCue added with a smile while she took her seat.

"If you need any more clarification, you can find me here – in my captain's chair," she concluded with a sparkle filter to emphasize her job title.

The video has been viewed more than 1.2 million times and McCue has more than 321,000 TikTok followers as of Thursday.

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McCue did not immediately respond to Fox News’ request for comment.

She has been a captain at Celebrity Cruises since the summer of 2015, where she has served as a master – the highest ranking captain role on a cruise ship, according to CruiseShipJob.com.

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Before she was employed at Celebrity, McCue worked her way up from 2nd officer to staff captain at Royal Caribbean Cruises, Ltd. And prior to that, she was a 3rd mate at the Disney Cruise Line.

McCue, a San Francisco native, received her bachelor of business administration in both marine transportation and business administration at California State University’s Maritime Academy.

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