I do no such thing; I merely draw an analogy to the broad grouping of social classes in orthodox Marxism, which equally does not argue that 100% of Class A are good and 100% of Class B are bad.
Meanwhile, let us consider Rand's philosophy as expounded by Rand herself; for simplicity's sake, and because she considered it such a vitally important work, we'll look at Atlas Shrugged. We are meant to glean from it a view of Rand's purely-rational, logically-defensible Objectivist ethics, but what we find is merely contradiction piled upon contradiction.
Selfishness, Objectivism tells us, is a virtue. So how is it presented in Atlas Shrugged? Well, while the selfishness of, say, Galt is held up as great and good, the selfishness of people other than Rand's heroes is painted as a vast evil, such that their very lives are to be forfeit as punishment.
And though Objectivism preaches an ethics based on the sanctity of the individual's rights over him- or herself and that subverting the individual's goals for the "greater good" is an absolute evil, Atlas Shrugged preaches that individuals can and should be killed as needed in the service of greater advances. Say, to expose corruption in railway management.
I could go on if you'd like, since Objectivism as expressed by Rand in her books has more holes in it than a slice of Swiss cheese, but hopefully you'll trust that I've actually given this some thought. The final impression I came away with was that Rand was trying to write tales of Nietzsche's ubermensch (which would resolve contradictions by putting her heroes beyond mere everyday notions of good and evil), but merely produced a caricature of his philosophy embedded into a series of one-dimensional and frankly unreadable novels.