Gurmukh Gyanis are not suppose to meet with women alone. They should meet them in Sangat. If the meeting has to be a closed door one, then the woman must be accompanied by her husband, brother, son, etc.
Srimaan Sant Baba Nand Singh jee Kaleranwale was very strict in this regards. Any Jatha member caught talking to a woman, other than his mother or sister, was expelled from the Jatha.
Any sort of physical contact (hugging, kissing, patting, shaking hands*, etc) with women must also be avoided. Sri Satguru jee (Tenth Master) would only touch women (other than his wives) with his arrow or siropa.
If Gyani Thakur Singh jee had strictly followed the above protocols, he would have never fallen into such a controversy.
* - We have to shake hands, especially in western countries with women at workplaces. Handshaking is a normal professional way of greeting people in the west, so this case would be a bit exceptional for Sikhs of the west. Refusing a handshake might be perceived as rude/impolite by the other party.
Bhul chuk maaf