Honestly that's the minority on /r/conservative right now. Most are saying he fucked up and he's fucking up by refusing the next debate. Many are even saying it's over.
That whole sub works on cycles - news breaks, there's an immediate negative reaction towards trump and a couple of days later the sub finds some way to spin the whole thing.
It's fun watching them get told how to think in real time, though I'm not sure if it's done big conspiracy with some russian telling them how to think or just a collective coping mechanism.