Ukraine's Elina Svitolina accused Belarusian Aryna Sabalenka of encouraging French Open fans to boo her by waiting at the net for a handshake following their tense quarter-final.
Svitolina has not shaken hands with Russian opponents since Ukraine was invaded with support from Belarus.
Before her loss to Sabalenka, Svitolina made clear she would again avoid it.
Asked if Sabalenka inflamed the boos with her actions, Svitolina said: "I think so, unfortunately."
Sabalenka responded by saying her reaction was "instinct".
It was a sour end to 28-year-old Svitolina's dream run at Roland Garros as Sabalenka, seeded second, kept focus to reach the semi-finals.