I think it's rude, but I have time blindness because of ADHD. My brain is simply wired in a way that changes my ability to estimate and judge time. I simply can not keep track of time! I also get distracted and easily forget what I was supposed to be doing.
For example, I underestimate the time needed to get ready for an appointment, causing me to turn up late.
Time blindness is a legitimate issue for people with ADHD. It’s not intentionally disrespecting someone else’s time.
I feel useless, stupid, stressed, and pissed off at myself. To combat it, I will set an alarm that goes off every 10 mins to keep on track, I have a routine app that is programmed to know how long it takes me to do each task, do hair, make coffee etc. And if an appointment is in the afternoon, I will go into waiting mode because I'm terrified of being late, or I will turn up an hour early.
According to research, the ability to perceive and estimate time is linked to the activity levels of the prefrontal cortex. A lower level of activity may contribute to poorer time perception.
Time horizon helps people determine how quickly a task is approaching and when we should start acting on it. People with ADHD tend to have a shorter time horizon and “future time blindness,” meaning that deadlines often enter their mental radar when it’s too late.
Time management is a multi-dimensional skill that involves concentration, memory, and planning. People with ADHD are often crap with time management.
Sorry for the waffle, I just wanted to stress that it's just not as simple for some people.