Hi! I'm the other guy.
The conversation was as follows:
OP "your dial says left not right"
ME "Oh **** - you're kidding me"
OP "Nevermind, just carry on. It's obvious what you intended to do"
ME "I'm so sorry but thank you - can't believe I did that"
If it was me I wouldn't hesitate to offer my opponent the same kind gesture at that inconsequential stage, regardless of whether I might ultimately win or lose.
This incident does not seem worth all the debate and hurt egos on this forum.