That really sucks. I think if you don't quit now then you will at some point in the future. Poor communication from above is not something that can work long term. Not only that, it's going to be hard to get out of the demotivation funk that this has created.

Anyway, don't let it get to you. I'd actually be a bit angry if this happened to me. Someone who is just out of college in their first job needs a leader to guide them and some basic mentorship - not this kind of shit.