When you work in an enviornment with non-jews and non religious jews, you have to be very careful not only how you act and speak , but also how you respect others. I am not saying this from a Halachic point of view, but from someone who has usually (but not always) worked with non-relgious and non jews.
You will meet all kinds of people and some do things you dont like, or even against he torah. Dont preach unless the person wants you too. An unwanted rebuke does more harm than good. A simple example is a co-worker is a toeivah jew.
If you cannot work in such an enviroment, it might be best to look elesewhere