A win deserves celebration without turning the opponent into someone beneath you.

Joy and contempt often travel together, but they are not the same passenger. Winning produces a real feeling that deserves to be enjoyed out loud, and somewhere in the enjoying it can slide into a story about the other side being lesser. That slide costs you something: it makes the result about their inferiority rather than your effort, which is a much smaller thing to have done. The people who stay gracious are usually the ones who took the contest seriously.

Celebrate fully and let the account of the other side stay accurate. Say what was hard about them. Congratulate somebody on the losing end before you leave.