This may seem pithy but:

The best thing to do when you’re frustrated at something is to walk away for a moment.

Your perspective is not the only one. What might seem incredibly obvious to you might not be to anyone else. Other people have reasons for doing what they are doing. If it’s unreasonable or you have a way to help them, they’ll probably be receptive if you can present it without triggering defensive reflexes.

Imagine being on the other side. Do you want someone reaching out to be kind to you? or to yell at you?

Some people won’t accept help. That’s okay! That’s a problem for them, not for you.