"The Act of 1976 requires it to be shown that the complainant has been treated by the person against whom the discrimination is alleged less favourably than that person treats or would have treated another. In deciding that issue, the conduct of a hypothetical reasonable employer is irrelevant. The alleged discriminator may or may not be a reasonable employer. If he is not a reasonable employer he might well have treated another employee in just the same unsatisfactory way as he treated the complainant in which case he would not have treated the complainant 'less favourably' for the purposes of the Act of 1976."