Kids are not bad, they may behave badly at times. Even young kids can differentiate between the two. Another point the presentor made was that parents and other role models need to themselves have positive self esteem in order to promote positive self esteem among kids. This means we need to feel good about ourselves as well. Our kids are then more likely to reflect that.
Parents can take several easy steps in prmoting positive self esteem in children.
Allow the kids to explore. Let them try things themselves as long as they are not putting themselves or others at risk or damaging property. When possible, allow them to make decisions. Be available as a guide when they need help. Even toddlers like to do things on their own.