An employer may legally treat and pay employees different (e.g. regarding training, holidays, benefits, etc.) so long as the difference is not due to illegal discrimination. The main forms of illegal discrimination are against an employee due to his or her age over 40, disability, religion, race, or sex. (Only forms of discrimination specifically made illegal are illegal; an employer may, for example "discriminate" against you because you are anti-NRA and they are pro.) If you feel that they are treating you different specifically because of one of these protected characteristics, you may have a legal claim (such as for the holiday and training pay you should have received) and should either contact the state equal/civil rights agency (or the federal EEOC) or speak with an employment law attorney about whether you have a case.