Their environment is unbearable. No, cubicles cannot be changed like some second grade classroom to suit the sensitive and fragile.
Difficult people are generally everywhere and anywhere inbetween.
The only way to survive them is to either quit the job or to gather up some skills which will benefit both parties. The latter seems to be a better idea. First, instead of lumping loud, distracting individuals together in groups, which sometimes occurs, try to identify who is the ring leader in most of the day s disruptions. From a practical standpoint, it may also help to throw a subtle sign to this person that they are making too much noise and let them know it is very hard to hear on the weak telephone that you have at your desk when they are around. This usually does the trick.