What if what they like to do aligns with what is specific to their gender? Or even if what they like is specific to the opposite gender. My son and my daughter

What if what they like to do aligns with what is specific to their gender? Or even if what they like is specific to the opposite gender. My son and my daughter both like My Little Pony (as do I, it's awesome) and I don't see anything that I could do to stop it, even if I wanted to.