Am I a bad person?

No. But you should learn to give advice without expecting anything in return.

No, this does not make you a bad person. You were honest that you were not interested, sill to be blocked for that. This is not a therapists office, if people want to help others, fine, if not, that is fine too. As you said, when you have done this before the person did not appreciate the advice and you can feel it is pointless.

Naw, you don't owe him anything.

Just makes you another person that learned from mistakes and wasn't going to do it again.
Not bad at all.

I honestly don't know why people do that. Maybe I'm a bad person but I don't have the answers to some of my own problems

I don’t know what to say. I can see both sides to this. You reacted due to past experiences so you was defending yourself and stopping yourself from being used. You told him straight out what your intentions was and you didn’t lead him on into thinking you would help and be there for him. I can understand why he would be upset as he maybe didn’t have anyone else to talk to and he maybe thought you was the right person to go to and he trusted you with his problems even though he didn’t get chance to talk to you about them.

Nope... not at all
And him blocking you right away is good sign you made the right decision

No. I wouldn't want to get involved in somebody's weird drama.

If he blocked you because you said no, wow not worth your worry.

No it doesn’t. You aren’t required to be a therapist to strangers.

No, he’s just being a whiny bitch

Not at all. Don't stress. You are good

No. Not at all. You did the right thing.

Naw.. your Just being open and honest

No.