YSK: Just because something is easy for you, does not mean that it is easy.
ETA; Why you should know; everyone has natural talents, everyone has skills they developed with practice or over time. Something that feels easy to you might be difficult for someone else to grasp, or they might have a different background or a different way of doing things. When you show someone else how to do something, or when you ask someone else to do something, you need to set aside your expectations on how they might do that thing, or how quickly, or how well.
Be patient. Understand not everyone comes naturally to every new skill or new talent. Some people have learning disabilities or just a lack of familiarity with skills you consider “basic.” And try not to belittle someone for needing extra time to master something you find “simple” or they may never try again!
Edit2: Kind of like how I can’t figure out how to edit this to save my life. I’ve been belittled in the past for being bad at things so my instinct was to delete this, but seeing all the conversation, I couldn’t bring myself to do it! Consider me a lesson in action!
One of the rules of thumb when teaching is to avoid saying something is “difficult” or “easy” most of the time. Usually there is not much benefit to the students in it, and other adjectives or descriptions would better capture the message without leading to discouragement.
It’s a source of amusement to see something referred to as ‘trivial’ in academic literature because it’s usually something fairly inscrutable. Whether we acknowledge it or not, we’re in a position of ignorance with respect to most topics and that’s okay.