People who use Fe, when making a moral judgement, ask themselves how they feel things should be
People who use Fi, when making a moral judgement, ask themselves how they feel
People who use Fe often use the moral judgements of other people to justify an act or decision
People who use Fi often use their own previous moral judgements to justify an act or decision
People who use Fe are hyper aware of others' feelings
People who use Fi are hyper aware of how others make them feel
(this is the most confusing distinction, as they often lead to the same result)
Most Common Positives:
People who use Fe are accomodating of others' feelings, and making others feel good tends to be their goal
People who use Fi are always aware of how they would feel when treated a certain way. self actualisation tends to be their goal
Most Common Negatives:
People who use Fe tend to side with the majority, leading them to be the types more likely to act like sheep.
Fe users are sometimes bullies because they believe the moral code of the majority is the more important. It's harder for them to be subjective.
People who use Fi tend to side with the individual, or themselves, meaning they tend to resist efforts to conform in any way.
Fi users are sometimes selfish because they believe what they feel is the more important. It's harder for them to be objective.
note: the two functions are mutually exclusive (although the end conclusion is sometimes the same) and every F type faces a decision to go one way or the other in every moral decision/conclusion. 1st function types are more likely to go with one or the other from a young age and show a strong preference, 2nd function types are more likely to mix it up or remain neutral at a young age, but increasingly choose the route most natural to them as they get older.
2nd note: even when Fe types DO side against a majority- it will be because a greater majority (e.g. society at large) or a different majority (e.g. the feelings of friends from childhood, over those of people at a new job) is more important to them.