I've always thought about this issue. And when in comparsion to ENFPs, I think they're good at treating others all equally. However, when it comes to those selected few who they bonded deeply, they'll be much closer and personal with them privately. In public, ENFP will treat and spread the equal amount of attention to the ones who bonded and those with a lesser extend at ease.
When it comes to INFJs, I think we can be somewhat obvious to show how close we are with any particular individual in public while keeping a distance with others, or those who we didn't connect deeply with. This has certainly caused many jealousy in the workplace for me, as I can be nice to everyone but I also can show that extra attention to those peeps who I've bonded. And I think sometimes, in the eyes of public, people may see us as cold or difficult because we don't hide our Fe subtlely enough as compare to Fi users imo.