Simply put, he showed bad personal judgement. If he wasn’t “hammered,” as I assume he wasn’t, then I’ll leave it at that, and hope he shows better judgement in his personal life in the future. A shame, none-the-less.
However, before anyone goes on a moral tangent, let’s keep in mind, he is human, and prone to human error. He wasn’t acting in his Religious function, and I see no way in which this should reflect on his spiritual life and spiritual judgement.
Truly, it is sad that his good reputation should be tarnished by one dinner-party worth of poor personal judgement.
We should pray for him.