Some people prefer to avoid facing unpleasant truths and resent those whose unwanted honesty forces them into such a confrontation.
Background Claims
Some people hate dealing with ugly truths and resent it when someone's unwanted honesty forces them into confronting these truths.
Others hate having any information withheld from them, even if it's a painful truth.
Setup
If someone is in group 1, and they are trying to employ the moral rule to , then ...
Evaluate
People in group 1 don't want to hear or confront the ugly truths. So if a G1 person is trying to "treat people as they want to be treated", then they will refrain from saying an uncomfortable truth to them.
People in group 2 want to hear every truth, no matter how uncomfortable.
The setup text doesn't clearly indicate whether this group 1 person will be dealing with other group 1 people or with group 2 people. But if we assume that throughout life we're going to encounter some people from each group, it means that the G1 person will always be withholding the unpleasant truth (because that's how they would like to be treated), even when they deal with a G2 person who doesn't want the truth withheld.
Goal
The most interesting tension here is what happens when this G1 person is dealing with a G2. The G1 person wants to avoid confronting unpleasant truths, while the G2 person wants all the truth they can get. So if the G1 person is treating people how they themselves want to be treated, they'll end up withholding unpleasant truths even though the person they're dealing with (a G2) would prefer to hear the unpleasant truth.
Look for a safely worded answer that addresses this tension.