My dad used to whistle at us all the time as children and he probably still does when I see him. I probably picked it up from him. I whistled to an ex SO and t

My dad used to whistle at us all the time as children and he probably still does when I see him. I probably picked it up from him. I whistled to an ex SO and they considered it disrespectful. I'm not sure I yet understand why it's disrespectful, not that I consider either opinion more or less correct. I just don't really understand that opinion. Maybe someone can expand on it?