i'm seminew so question

So i'm semi new less then 30 playtime hrs. and Im so confused. Every time i knock someone and then finish them my buddies just go "cause you killed the buddy now this guy is going to hide and we will be at a lost now" and just keeps repeating that but says their not "blaming me and targeting me" about it just stating the events. 1. is killing a down player a nono in this game? im from like apex where we kill then grab what we need from them super fast. 2. is this them blaming me or am i okay to get pissed that they keep saying this and then blaming me for "if we die to the buddy".