Love it when you get one of those numpties who pre-emptively says GG when they think they've won, only for you to hold on and win the game. Just played a guy and I actually asked him during his bunker rush: "Why are you saying GG? are you conceding?", and he responded "No, you've lost". From there I just decided I had to win for the good of eSports.
The thing that probably saved it for me was that I had an early expansion up which he failed to kill. I could actually tell with each attack he made that he was beginning to realize maybe the game was turning against him, so he panicked and went for drops, but unfortunately his medivacs were duly met with some tasty feedback from my Templar. Killed about 2 that were presumably full, so 20 supply, with only one unit
Ultimately the game ended up with one engagement where 4 or 5 storms killed his entire bio ball, and I don't think he even attempted to get any EMPs off with his many, many ghosts. Bad player, but that doesn't bother me as he was a league above in the rankings. It just feels great to bring these people back down to Earth and teach them that bad sportsmanship gets you nowhere. I hope he feels a little foolish!