If you don't make an attempt to mediate and resolve the problem, then you are not in a position to try to break the lease. If you have to prove that you ae being denied quiet enjoyment under these types of circumstances, you have to prove that you have been reasonable and attempted to resolve the issue. What you are describing seems to an observer like something that is at this point relatively minor, although you seem to be having a strong reaction, and could at least possibly be resolved if people sat down with a mediator and had a reasonable discussion. Refusal to do so could be seen as escalating the situation, not as giving you a reason to break your lease. There may be some other, unrelated provision of the lease that you could use, but you would need to have a real estate or landlord/tenant attorney to review the lease to see what options are available.
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