Boisson, who had walked back on to the court while Dart was still sat down, appeared to be out of earshot when the Brit made the comment to the umpire.
She posted several clips from the game later to her Instagram story, with no mention of the comment.
Boisson, who is making her first WTA Tour appearance of the season after struggling with injury, is currently 303rd in the world rankings.
She caused an upset by beating the 62nd-ranked Dart, who lost her serve four times in the match.
The Briton was appearing in her second clay-court match of the season before next month’s French Open, having also lost to Varvara Gracheva last month in the first round at the Charleston Open.
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