When you talk with them, you can realize if they are really interested in languages; i'm mean a man who asks you for the first time if u have boyfriend, or if u are alone in home and if you have cam, you can begin to realize that they are not really interested in languages, so u can just give: "delete".
If you do it for sure you will enjoy Italki! Just ignore them , by the way have for sure that in Italki there are funny but at the same time good guys, just look for them, take ur time, and forget some loosers