How to tell without sounding like a b*tch

So how do you tell someone you don’t care for one of there friends. From my point of view that friend depends way to much on that person and blames me for them not getting to hang out with that person. When that friend just wants to go to bars/parties or do drugs. Bad drugs. When that person doesn’t do any of those things. Also that friend asks that person for money like in 100s and 200s. When that person is getting married soon. I just want to know how to tell that person in a way that won’t make me sound like a bitch. Because I’m just trying to look out for this person. When this person doesn’t know how to say no to people.

Any advice please it’s very much appreciated.

Also sorry I’m not sure where else to put this where it would get seen. My apologies.