My son was expelled from preschool at age 4. I learned that being a good mom isn't about having a 'good' kid.

My son was expelled from preschool at age 4. I learned that being a good mom isn't about having a 'good' kid.

Milko/Getty ImagesMy son has a sensory processing disorder and had a hard time following rules at preschool.When he was 4 years old, his preschool expelled him because of his behavior.We enrolled him in a private Waldorf school and he has been there for three years.Kids with disabilities are often labeled "disruptive," "defiant," or "difficult." People often assume they're inherently bad or that their behavior is the result of permissive or inco…