Drachenstein goes out of his way to hire minions competent enough to think for themselves but loyal enough not to betray him.
Alex outright refuses to degrade himself for Drachenstein.
Discussed: "Why does Alex stick around with Professor Drachenstein? I mean, surely being turned radioactive and being gene-spliced with a beaver would be too much. That's loyalty."
Conversed: "Looks like I need a new subject for my experiments. Find a loyal minion with the brain of a pea and a lack of self-worth."
Deconstructed: Alex is a great admirer of Drachenstein's work, and is glad to be around his hero and assist him with his experiments. However, when Drachenstein keeps treating him like garbage, Alex loses his enthusiasm and submits to a life of abuse and underappreciation.
Reconstructed: But he's just glad to be working for Drachenstein.