Not wasting your time. The burden is on the employer to prove serious and willful misconduct at work.
You may get a sympathetic hearing judge who understands that it is hard to give service with a smile when you are provoked in a hostile manner.
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File the appeal and go to the hearing prepared to present your past reviews and your facts. EDD does not always get it right the first time.
Once you get your hearing date, attend the hearing and make your best effort to present all of your evidence and explanation of your circumstances. The ALJ may or may not find that the evidence rises to the level of a serious or willful misconduct disqualifying you from benefits. The State of California EDD also has some helpful information online; you might want to review all that for preparation prior to the hearing - http://www.edd.ca.gov/Unemployment/FAQ_-_Eligibility.htm. If it is economically feasible, you might also wish to seek confidential consultation from an employment attorney in your area. Keep in mind that details posted on this site are not confidential and can be accessed by anyone, including your employer. Good luck!
Nothing in this response is intended as a legal consultation or advice on your particular case, and is provided only as a general statement of information, and only with respect to California law. No attorney-client relationship is created and no contract for legal services is formed as a result of this posting or other postings before or after this posting. Various limitation periods, deadlines and cut-offs also may apply. You should therefore seek private consultation from an attorney regarding the merits of your case and the deadlines involved in your matter. Since this is a public forum, this posting is not confidential.