Ah I understand where you’re coming from, my two best friend’s are INFPs. The difference here is in INFJ’s judging function versus INFPS perceiving function. For example, while people like you and me prefer to make choices quickly, we ant to get the job done and we value closure. This is very different to the way an INFP handles such things. You see Perceivers like to keep many options/choices open and because of this they tend to avoid or put off decisions. Knowing this difference it would make a lot of sense that a INFP might see an INFJ as opinionated and rigid, when in reality we just have different ways of going about decisions. I hoped that helped. If you ever have any other questions feel free to shoot me an ask.