McNairy was born in Dallas, Texas, to Alicia Ann McNairy (née Merchant) and Stewart Hall McNairy.In addition to a house in Dallas, the family had a ranch in rural Paris, Texas, where they spent time on weekends and holidays. Growing up, he did theater in after-school programs. His father began calling him Scooter when he was about two years old. "A lot of people are like, oh, it must be some amazing story. But it's because I used to scoot around on my butt," says McNairy.
McNairy has stated that he is "highly dyslexic" and that he had to "go to dyslexia school for four years." He describes himself as a visual learner and was attracted to films for that reason. McNairy attended Lake Highlands High School.
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