Opponent threw a fit over an out call

Ladder league, opponent got mad about a close out call. Bang bang play on a smash, but it landed near my feet and I called it out. He (teenager) got mad and started yelling, ruined the vibes. Tried to explain what I saw, explained hey it goes both ways sometimes and it's my call. But the damage was done.

How do you all deal with that situation? Anything effective to get the mood restored? The rest of the night felt very tense over one call.