The bad type of Christian:
* Talks over you when you try to explain your viewpoint
* Acts like everyone believes in some god
* Does not respect atheists
* Is a bigot (this includes being racist as well as being hostile toward the LGBT community)
As to the last bit: What do you mean by hostile?
It's a part of many branches of that faith to see any LGBT individuals in a dim light. This does not mean they all necessarily wish ill will upon such people, though.
I have met many Christians who will accept that I am an atheist and are generally respectful (and avoid using phrases like "god bless" when talking to me), and who accept LGBT people for who they are, and who can remain friends with people who leave the church (one Methodist woman I know is still friends with a lesbian who left the church some years ago). These would be what I would consider the "good type of Christian", to the extent that applies.
(I should point out that many types of belief systems are possible; I know someone who identifies as both a Christian and a pagan, for example.)
I could also mention that there are bad people in every religion (or trait that would fill the "religion" slot), as well.
The rest I get, but why is someone saying God Bless disrespectful in general? If they do it out of goodwill and not hate then why get upset(if you do...I don't know if you do as i;m not you) over it?
Heck, many non-believers I know seem to be ok with it/stuff like Merry Christmas/etc being said to them. They are just words, after all, and intent does matter. :)