[Swiffy0]

I'll go ahead and say that a sprinkle of humor would help a lot here.

If a coworker comes to you with a problem that is trivial to you, it shouldn't be a problem in the first place for you to say "Oh just do X".

The problem lies in how the other person takes it and most importantly if the environment allows people to safely "confess" they don't know something, regardless of how trivial it is.

If it does, there shouldn't be any problem. The dialogue can continue in multiple positive ways such as "Oh that didn't cross my mind, thanks!", "I don't know how to do X", "Can you show my sorry ass how to do X?", "Just do X huh... How do I do X again?“, "See the problem with X is that I don't know how to do Y / how to apply X in this case" and "Well obviously I should do X! I was just testing you"

If it doesn't, the problem is with the environment.

When you have a problem with the environment, you shouldn't try to "solve" it by making it impossible for the problematic thing to enter the environment (censoring comes to mind), but instead teach the environment how to deal with the problem when it eventually and inevitably enters it.