Butcher's day went from bad to worse when McGivern's own goal shortly after the interval was quickly followed by a red card for striker Danny Haynes for an apparent stamp on Wotherspoon.
Butcher said: "We changed the system round and for the first half I thought it worked very well. St Johnstone changed their system round to match ours, which is an indication that we were doing well.
"But from their first attack they scored and we couldn't then respond in the right way and Sean has had to make another good save.
"But we've done well up until the box, again, and we've been powder puff in front of goal, again. I don't think Alan Mannus has had a save to make apart from a Frazer Wright header.
"I said at half-time 'let's go out and give 45 minutes of real effort' but we didn't start the second half particularly well, for whatever reason, and we conceded a very sloppy goal.
"Then the sending-off happened and it was game over really.
"I've got no complaints about the red card. I've seen it a few times now and I don't know why he did that.
"Steven MacLean's had an easy decision to make. When you're 2-0 down and down to 10 men against a side that has got confidence and knows a top-six place is there for them, they're obviously going to see the game out.
"It wasn't a happy second half at all."
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