I think the first important question to ask before we tag someone difficult is "why do we see them that way"

Often times, it's our biases that label people as difficult even when they are not. Even if they do turn out to be difficult (as our preferences for people dictate), can we ask next "what part of my behaviour contributes to it"

Asking these 2 simple questions can help us shift from a negative frame of mind to a positive one and seek solutions instead of worrying about problems.