Diablo III: Reaper of Souls

So I tried doing some public rifts since it's fairly fast with an okay group, and I can carry easily on T3 regardless on my Crusader. Two people from the same clan join my game and struggle to keep up. They call me out for running too far from them and losing the MF bonus because they both can't kill the leftover minion quill rat of an elite group, and they kick me from the game when I turned around to kill it for them. The guy also tells me I'm a noob and he can handle T5 when I call him out for being shitty and kicking me from my own Rift. He has as much toughness as me with 1/4th the DPS and no elemental or skill bonus. In fact, he had a Stone of Jordan equipped and he rerolled the elemental bonus to Attack Speed on a Crusader. How to be fucking good 101.