Oh, certainly. I don't think that anyone is only a "theist" or only an "atheist".
For instance, I am an atheist (since I don't believe in any gods) but I'm also a skeptic, humanist and secularist... among other things. "Atheism" only describes what I don't believe (and even then, only one class of thing that I don't believe); those other terms describe what I do believe. However, my approach to these philosophies/viewpoints is that they seem to work very well, not necessarily that they're absolutely, objectively true.
I guess the thing that annoys me is when people say things like "atheism has no answers! Gotcha, atheists!" ... as if this means that atheists can't have answers. Of course we can; they're just derived from things other than atheism. No single label is going to completely define anyone, whether it's "atheist", "theist", "secular humanist", "Anglican", or "lapsed Catholic".
One possibility I see is that people tend to stop listening after they hear "I'm an atheist". I think that historically, we've been so wrapped up in God and religion that a person's view on these subjects is considered all-important. "Atheist" generally implies "I reject God and religion", so at that point, the listener has already heard all he needs to hear and doesn't really care about the nuances of that particular atheist's worldview.