I have a few suggestions for this queer predicament.
1. Renters Laws, look them up for your state - every state has them no matter what culture or country you come from, if you are a renter then you must abide by them.
2. Noise control laws are also there, normally any noise after 10 or 1030pm can be phoned in.
3. They have no right to discriminate despite their predicament. If you are uncomfortable about this and you live in America please practice your right to voice your opinion to your landlord without and repercussions.
4. If after you politley try everything within your power and it gets worse but you can not move because of money or other obvious reason then Pro bono, baby.
5. This is life. They are people, just humans. You are a person, only human. Why can one human being not communicate with another without strings and politics and worrying about what that other human may say or think? I suggest cornering the mother when you go to pay rent and say what you gotta say. If she wants the money, she will listen. She may not respond at all, but you are still planting the seed in her head. If things get worse after that... threaten with the laws or pro bono you looked up. That stuff is more of a fall back than anything else.
Make a plan, follow through, and back yourself up. If you BF wont support you through it than screw him, you are a woman - grab your ovaries, march over there and demand silence!