The answer to that question is I wouldn't. Nor would I judge another brother for my own personal conviction. If this guy was openly fornicating or blaspheming and dragging Jesus name through the mud that would be different.
"Speak not evil one of another, brethren. He that speaketh evil of his brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge."