I got sacked from work for using the F word, never been given a warning ever my records clean. Is this fair?

I have worked for the company for 7 months now, and as a manager a had accusations made against myself which made me stressed upset and frustrated, and when one of my advisors was being nosy i asked her to turn around she didnt follow simple instructions so i told her to 'mind her own f**kin business'. i have been sacked on ground of gross misconduct under 'bullying, harrasment and abuse in serious breach of the companys equal opportunities policy' i have appealed and it is going to be held on 15th May. I believe it to be too harsh as it states under serious misconduct that a final warning should be given for offensive language, negligence in job performance and insubordination. Was my boss fair to sack me?