It was his job to like those things and talk about them. Would you feel the same mire towards a salesperson who, after switching jobs, did not continue to try

It was his job to like those things and talk about them. Would you feel the same mire towards a salesperson who, after switching jobs, did not continue to try to sell the products from their old employer? I don't understand why a professional evangelist, in a paid position, would be expected to behave any differently? He is a salesman.