I won't literally say that I lost my respect for them, it just that I decided to distance myself from them, especially if I find out that they are not what they claim to be. I have had couple of acquaintances in the past that I really held in high esteem, but once I discovered that they are not practicing what they preach, I just kind of keep them at arm length.
For example, there was this guy that used to seek my advise on how he can get some certain areas of his life sharpened up, which I generously did to the best of my ability. As time went on, I realized that he didn't take what I admonished him on seriously. And that alone made me to conclude not share my valuable insights of relevant life issues with him. Fortunately, he came to me again to seek out my wisdom on other issues, but I kindly declined since the other ones I advised him on did not see the light of the day.
It wasn't that I lost my respect for him, but I only just found him not worthy of my time I dedicated in advising him.