I'm assuming you're using the app. I think as long as you comment in a thread at least once it will show in the participated section and every time updates are made in the thread, it will pop up towards the top. I, personally, don't think you need to apologize....seems you're more inconvenienced as the negative comments bother you. Unfortunately, I think the only solution is for you to scroll pass the threads/comments that disinterest you because I just looked and there doesn't seem to be a way to hide a thread in the app (I don't use the app so maybe ask in the member questions section).