Secor941,
The people you speak about are OPERs, not OPs. They have access to commands like /SVSNICK which can be used to change your name to something else.
Sadly commands like this are often abused on some networks because a lot of people view having OPER status as a badge of honour giving them a licence to treat people however they like.
Unfortunately there is not a lot that can be done about it. If the staff of the server you use are too immature to manage the server well then the best thing to do is take your friends and use another network.
