I was called into the office and spoken to in a very aggressive and bullying manner because I have been calling a worker by their legal name as opposed to the name they wish to be called. For the first 1.5 years, this worker was called by their legal name then switched because they identified as the opposite gender. Manager told me "you will call him but his preferred name". I am kind and respectful to this person. I feel at though my rights are being violated? Am I correct?

In Alberta, employers cannot discriminate against a person because of their gender, gender identity, or gender expression. Employers can be held vicariously liable for the actions of its employees. Vicarious liability is a legal doctrine that holds an employer responsible for the tortious actions of its employees committed within the scope of their employment.
As such, if your conduct or actions towards your colleague are found to be discriminatory, you may be able to be disciplined by the employer for your conduct. If you would like to discuss the specifics of your situation further, please contact our Firm for a consultation.