I agree that the "it's not my fault, it's everyone else keeping me down" sentiment is entirely antithetical to Objectivism. Indeed, one of the clearest distinctions between the good guys and bad guys in Atlas Shrugged is that the good guys are focused on getting things done, no matter what, regardless of whatever obstacles are thrown in their path by the villains, while the bad guys are always making excuses and looking to blame others.

However, I think it probably is correct to say that many individual members of the Objectivist movement did exhibit this kind of behavior, at least some of the time. Sadly, Rand in her later life and many of her closest followers were often decidedly poor exemplars of their purported ideas, and it's valid to criticize Rand as such. But that doesn't necessarily mean that the philosophy itself is naturally prone to this vice.