My impression is that Fe-aux folks can have specific types of difficulty in relating socially because the Fe creates a strong need for connection, but the dominant introverted, perception function causes them to be more individualized and withdrawn. This can create an internal dichotomy, but also a less efficient way to establish connections than their extroverted Fe-dom counterparts. The Ni and Si doms can also detach either into nostalgia and the personal, experiential world of Si, or into the theoretical, imaginative, abstracted sense of Ni reality.
Please disagree if this doesn't resonate, but I think that Fe-aux are at high risk of staying in unhealthy relationships and losing a sense of self in order to maintain peaceful connections. While it's true that I'm going through a personal rough patch right now, I am somewhat embarrassed to admit that when I read this list of socialization traits on a "recovering doormat" site, I realize that I am struggling with every single thing on this list.
Part of the reason I get angry and push back when people berate INFJs and ISFJs is because I understand their tendency to internalize all of that sort of negativity. Then when I push back people just increase their criticisms rather than listening to context, rather than trying to understand that when you tell a Fe-aux something negative, it is like speaking those same words through a megaphone for most any other type. The words hold a different meaning and so become less accurate. Anyway, please disagree as needed.