New guidelines could be introduced for Aberdeen schools after a primary's use of the term winter cards instead of Christmas sparked controversy.
Kaimhill School recently faced a backlash over its suggested terminology for cards over the festive period to reflect inclusivity.
Now a motion is to go before councillors calling for clarity in future - and to not "exclude" Christianity.
It calls for guidelines to be issued to schools "to ensure that any misunderstandings with regard to festival-related activities do not happen again".
The EIS union said personal attacks on staff were unacceptable.
It emerged last month that an email had been sent to parents about Kaimhill School's Christmas cards plans.
The message was said to be a reminder the school was a "multi-cultural and multi-faith community".
It said: "We value and respect the diverse cultures, beliefs and traditions represented within our school.
"To reflect this inclusivity within our communications, we refer to seasonal cards as 'winter cards' rather than 'Christmas cards'."
It added: "Of course, families are free to refer to these cards as Christmas cards if they wish."
Staff at the school received abusive messages after the message ended up being shared widely on social media, including by political activist Tommy Robinson, whose real name is Stephen Yaxley-Lennon.
'Not happen again'
Now a motion is set to go before the council's education and children's services committee.
It calls for the committee to agree that:
Personal attacks on individuals/staff or schools are not acceptable
Schools must be respectful of all faiths and festivals
"Inclusivity" by definition does not exclude the Christian faith
The terminology which defines a faith's festival should not be replaced with a season
It issues guidelines to schools to ensure that any misunderstandings with regard to festival-related activities do not happen again
The committee will meet next Tuesday.
Ron Constable, the joint local secretary for the EIS in Aberdeen, said the union did not have a position on school activities.
"What we do have a position on is the health and safety and wellbeing of our members and school staff at Kaimhill," he told BBC Scotland News.
"When our members are subject to some horrendous personal attacks through social media, that is completely unacceptable to us.
"I think what we have to get back to is these are dedicated professionals who are teaching young learners in the school community and they should not be subject to the vitriol and horrific comments being aimed at them."
He added: "I think the important thing for people now is to take a step back to lower the temperature and allow our colleagues to educate the young learners that they care for."