So you're saying he doesn't deserve respect because he recently hasn't been contributing?

Recent means. Can you limit the time frame? I am sure such a thing doesn't happen within a few weeks.

Does that mean that when he starts financing everything again like he was doing in the past before his financial issues, he can start disrespecting her, too?

She is self-dependent, and I guess she doesn't need your friend's money. I am sure she will break up for sure when your friend starts to disrespect her.
Your friend wants to carry on such a relationship where his partner doesn't respect him. Don't you think it's shameful enough? A relationship without respect is kind of a joke to me. How can you expect respect for such a person who doesn't give respect to himself?

it means the poor person in the relationship doesn't deserve any respect..yes?

It's not only about the finances. It's about the mentality. Your friend can't give her the sense of security that he will do better in the upcoming days.

If I were in your place, my suggestion would be "Make money, show how capable you are, and earn respect by your own effort" rather than giving sympathy to him.