Fractional FO reported an NMAC while on approach to an airport.

Narrative

While on the RNAV Yankee; runway 28 right; we had a traffic conflict from our left about 700 feet below us; I called it out. We were cleared for the approach and we started to descend on top of the traffic. The captain; who was flying; did not set the bottom altitude; but just selected the app. I did not see this error because I was looking out the window for traffic. I heard him say the plane won't go down and I looked down and told him you need to set you're altitude alerter to the bottom altitude. He did not do it and decided to choose vertical speed and spun the dial to descend. We were quickly within 500 feet of the traffic passing beneath us and we received an RA. Just before we received the RA I looked at his altitude and the next fix altitude and he was already 150 feet below the next fix. Right then we receive the RA and he did not comply. I called out the RA and he told me we don't have an RA 'I just need to level off'. I repeated comply with the RA and he did. As soon as we leveled; the RA went away and I notified the tower. We continued with a stable descent and normal landing. Captain has very poor situational awareness consistently missing checklist and callouts. Was on Bluetooth at low altitude; on his phone and looking out the window giving me a narrative on the scenery or listening to something on his phone. He was distracted at all times! I would call for a checklist and he would ignore me; he would get a CPDLC and not respond to it; and I would have to prompt him; I would call for flaps and he would not respond. The captain would not cross check points before departure as required by the AOM. I would request point verification after cockpit set up and his reply would be; I already checked them! Very; very; very poor situation awareness in and outside of the aircraft. I would be reviewing the arrival procedure and he would just start talking about something random and interrupt me. I spoke with another first officer who had flown with him and they said he is a known entity and has been this way for a long time. We had to call fatigue the next day because of high stress in the cockpit and nothing else. I was mentally exhausted trying to do mental gymnastics to keep up with what he was doing. He was more worried about giving me pop quizzes about random things in the airplane then following SOP's this is a safety of flight issue and should be addressed! Suggestions: I think the company should have an ongoing survey to rate the pilot you fly with. Possibly rate them on SOP's; communication and knowledge. I also think that there should be an evaluation process for any pilot over 65 years old or that has had ongoing issues or reports of poor cockpit etiquette or unprofessionalism.