I think a more significant point than the status of R’ Laughing is to realize that this is not only being read by a bunch of Yeshivalite shmoozing in a Yeshiva coffee room. It is being read by everyone in the world. Imagine you had a brother that you were close with your whole life and then he joins a Conservative synagogue. Make comments with the love and sensitivity that this very brother is reading everything you say hear. What would you like him to hear?
Even insinuating that your brother is a kofer is not the smartest or kindest thing to do. It is also probably not true.