There is no set rule unfortunately... but if you feel that they are being extremely rude and/or is harassing you a point you can report them.
The abyss is still by far the best place to get exp fast so if you'd like to go in... I would suggest that you at least go in with one other person. It is also a main source of income for a lot of lower levels... and up until the 60 abyss. So try it out and see how things go. :3
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