I don't think that at all. I know that many atheists have not examined their views, because they always have a ready made response from the four horsemen when a religious person approaches them. Some of them always respond with insults and 'woo woo' statements, and this is the mind of a mocker- not a thinker. I don't mean to imply all atheists are thoughtless. I have encountered many of them though that shrug off any other view with what I just said. Mockery and contempt. That is ignorance by one of it's most basic definitions. To outright dismiss what you don't understand, or don't want to try to understand.
Why are you assuming that mockery and contempt are knee-jerk reactions? Do you think that it's impossible for someone to properly consider your position but decide that it's lacking?
It is these atheists I think have not thought about their views much at all. What I am here describing. I think philosophical atheists like humanists do better, but those are becoming less and less over time. I understand why that is, but it would be taking the conversation another way. I understand why humanism is dying though.
It sounds as if you measure how correct an atheist is by how friendly they are to you. Is that a fair assessment?
Another question one might ask is what made atheists reject all religions, just because they concluded Christianity doesn't work for them? You can't tell me they made a reasoned and thought out decision if they simply jumped from Christianity to atheism. That's actually a simple-minded person, thinking their parents were supposed to be the authority on everything- and they let them down.
Atheists haven't necessarily rejected every religion; they just haven't accepted any.
(Any theistic religions, that is; some religions don't require a belief in gods)
... though the criticism you're levelling at atheism
would be valid for many religions. There are plenty of exclusivist religions that claim to be "the one true path" and that every other religion is wrong. You might want to ask
their adherents how they managed to reject religions they've never even heard of.
... but generally, atheists don't claim to have done this. They just say that they haven't been convinced of the existence of any gods.