You're fine bro!
She was probably just confused and wondering why you came to her with it. Try saying something like "I have a bad back, please don't slap me..." or something like that to him next time and that should fix your problem!
Don't sweat it
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ADHD-PI & OCD
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Brother With Aspergers, Brother with ADHD-HI
Mother With ADHD-PI, Father with Aspergers