One option might be to require all managers, yourself included, to attend a training course on it, to make the point to them all that respect is particularly required from managers, because of provincial human rights and labour law.
Don’t keep it a secret from the staff. It’s a good message to send to the staff that the managers themselves are getting training on the issue.
If you go that route, choose the course provider carefully. Ask around from colleagues in other businesses for recommendations.
(There was one fiasco recently in Ontario where the sensitivity course providers were so dogmatic and non-sensitive that one of the managers attending later committed suicide.)