There was a famous story about The Vilna Gaon and some of the Misnagim
A Misnag went to the Vilna Gaon telling him a Chassid R’L had a women sitting on his lap during a meal on Tisha B’Av and the Vilna Gaon said Chassidis was Kefira
When the Misnad did not tell the Vilna Gaon was the girl was the man’s daughter and the mean was on Shabbos T-sshia B’Av