That's not true of all INFPs. It's true that we tend to be nervous about standing up to people, but we have strong moral beliefs and many of us want to advocate for them. If one of my friends says something I disagree with, I will tell them why I believe it's wrong. I don't like getting in to debates, but I do think what I believe should be heard. (I think the "INFPs are too sensitive to talk about things rationally and always act victimized" thing is a negative stereotype - let's not spread stereotypes about our own type.)INFPs rarely reject other people's opinions. If they disagree, they'll most likely not say anything/act like a bullied child.