The ones who will always find something wrong
Unpleaseable people are not the people to spend your time trying to please.
Co-creating with and serving others is essential and leads to our long-term fulfillment. However, if you seek to make a difference for someone committed to staying offended, your energy will be wasted. These folks also impact you deeply when you focus on them because they can cause you to doubt your contribution and give up.
Continue to get better and do better, and keep your energy on those willing to do the same.