When someone is trying to pressure you into backing down (when you know you are right) they are usually not arguing over what is true / false. What they are trying to do is assert their dominance over you. And thus, those that do not come to you aid are not forsaking the truth, they are avoiding turning a small engagement into a war.
When talking about the truth (false flags, govern-cement doings...) you cannot argue these points. Either the person already believes them, or is indoctrinated to not believe them. So, see yourself as planting a seed. When that seed is ready to grow, they will come looking for that information.
Through our 12 years of govern-cement indoctrination camp, we have been conditioned to identify with the "truth's" we were taught. It is not a normal state. (Read books from over a hundred years ago about debates) It is the state all "educated" people find themselves in today. An attack on someone's cognitive dissonance is taken as an attack on that person very being.