In Act 2, What objections does Torvald raise about employing Krogstad in his bank? How do his objections reveal the shallowness of his character?

Torvald says that Krogstad is an embarrassment and that he cannot work with him any longer. He explains that they are on a first-name basis only because they went to school together and that this -familiarity humiliates him. When Nora calls Torvald’s reasoning petty, he becomes upset and sends off a letter dismissing Krogstad. He then goes into his study. This reason is certainly a shallow one. It has nothing to do with Krogstad's performance more than it has to do with Torvald's shallow and petty personal problems.