Is the owner of a mixed WhatsApp group sinful due to the joking and trivialities occurring therein between young men and women, and what should he do about it?

Such mixed groups are a pretext for forbidden interaction between the sexes, facilitating communication and the establishment of relationships between them. These groups may begin with a good intention, but they can lead to undesirable consequences. Therefore, the group should be canceled to block the door to temptation and to protect oneself from the sin of facilitating the unlawful. There is no necessity for male and female students to communicate together; rather, each sex can create its own private group.