The difference between a child psychologist and a child psychiatrist is important to understand. Child psychologists are doctors trained to diagnose mental and behavioral disorders, and can provide therapy and counseling.
Not all lectins are bad, but some are (or at least, can be). A subset of lectins that can be found in large concentrations in the seeds of grasses (i.e. grains) and the legume family do have some properties that can make them very problematic for human health, namely that:
The function of lectins also depend a lot of the individual and how sensitive their digestive system is as to how they will react to specific types of lectins. The foods which contain particularly harmful lectins include grains and legumes, which is why they are forbidden on the Paleo diet.