What evidence argues most strongly against social learning theorists' claims that observational learning is a key causal factor in personality development?

The social learning theory was developed by Albert Bandura and it is based on the idea that individuals learn by observing other people, their attitudes, behaviors and outcome of their behaviors. The evidence that argues most strongly is that on an adult personality, the effects of shared environment are non-existent or possibly very weak.

answer; i believe its (transgender);