@amygarside,
Gossip and rumors are prevalent in this field, and it's not uncommon to use such info to put down others.
Have a thick skin, don't hold grudges, don't talk too much about your personal matters (as these info can be used against you), and contact nurse administrator/ manager if it's bothering you and effecting your work.
I personally have not encountered bullies in my field of work in the hospital, yet.