My brother thinks my bf should pay my rent

I asked my brother to help me out with my rent bc I recently lost my job and I’m now starting a new job. I’m not making enough money because I’m in training right now. My brother says I should ask my boyfriend to pay my rent. & I would but here’s the thing. 2 of my brothers live with me and refuse to pay rent or bills. Why does he feel like my boyfriend who doesn’t live with me needs to pay to keep a roof over two grown able bodied men heads?? I’m sure he wouldn’t mind paying it if I lived by myself. But I have two grown ass men who have money living here who won’t pay anything. I’m asking the right person for rent money right? They have no business saying that my bf should pay right? He doesn’t live here. He comes to see me not to live here. If I wasn’t here he wouldn’t be here. He’s never here when I’m not here.

Now they’re threatening to fight him because he won’t pay my rent.