I don't think it is inappropriate. Everyone is free to accept or decline re-matches. One is not even obligated to tell the opponent why he declines. We both live in a free coutry so why should you feel bad when you decline re-matches or don't offer re-matches?
Going on vacation after losing
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I think the best time to go on vacation is after losing.
Does this seem inappropriate?
What if the opponent offers a re-match?