Simply put, one man’s food is another man’s poison. Generalizing that all foods with high levels of lectins should be avoided is not the best approach. If you are chronically ill and don’t know why, food lectins can and should be investigated as the potential cause or contributing factor.
Of course the common sense rule applies. If it doesn’t agree with you, don’t eat it.
Nuts and eggs are not toxic to everyone, and psedo cereals should be avoided unless you have a pure source that is not cross contaminated.