I was just thinking about this question actually... "I wonder if my kids would consider me difficult?"
Our children are 16, 15, & 7, & I'm certain there are times when they do think I'm being difficult. But, then again, there are times when I think THEY are the ones being difficult! LOL!
But, primarily, it's all been due to parent/minor child issues - typical stuff like "You can't wear that" or "You have to clean your room first" or "No, I'm not buying you that video game" and "Yes, I do need the password to your phone."
There are instances where I think things should be done a certain way - from things like "You have to rinse the bowls BEFORE you put them in the dishwasher" to how we open Christmas presents on Christmas morning. And, for the most part, they go along with me & my quirks.
However, honestly, they probably have the most difficulty with how much I worry & the "restrictions" they feel due to my worry & anxiety, if that makes sense.
I actually don't think we've gotten into the stages yet where I could really be considered difficult, & I think the grown up child & parent relationship is a whole new playing field.
For my part, I do consider my own mother & my mother-in-law a bit difficult w/ some of their expectations for family holidays & get-togethers. My mom can be a bit passive-aggressive, plus she's nosy & gets her feelings hurt very easily. However, I love them both dearly, and I realize that someday I'll be the mom & mother-in-law of grown children, so I try very hard to show them grace & treat them fairly & respectfully because my turn is coming soon.