When you count the Omer during Maariv, you can say the blessing that precedes the count only if you have not missed a day of counting. If you missed a day, you can say Amen to the blessing said by others, but may not say it yourself. This is because of the way the commandment is phrased:
And from the day on which you bring the sheaf of elevation offering — the day after the sabbath — you shall count off seven weeks. They must be complete: you must count until the day after the seventh week—fifty days. [Lev. 23:15-16]
Enforcing this rule may publicly embarrass those who missed a day, because it clearly identifies them. Embarrassing someone in public is a serious violation. Practically, how are these two conflicting concerns reconciled?