What did you expect them to do? Waste 10 minutes by not fighting back? It's too bad that your team left, but it is better to get the game over with a Mercy than to just waste everyone's time. Also, why do you assume these players are Trials sweats? I found the game you are referencing. While one person has 70 flawlesses, one person only has 2 flawlesses and the other 2 have none. One of the 4 on their team has a 0.55 K/D. I'm a less than average player in PVP but will sometimes play with friends that are pretty good in PVP, that doesn't make us sweats, it makes us friends that want to go play the game together, kind of like how you wanted to play the game with your brother. Don't blame them for wanting to do the same thing, but also being better than you at PVP on average. If you don't like getting defeated by players that are better than you, try playing PVE content.