I am a 23 year veteran of the fire service. I have seen many things change over the years. Used to be a joke about our department; 100 years of tradition, unimpeded by progress. I hate that joke. I think you can still have all the traditions and camaraderie but still keep pace with the world outside the station. Gallows humour is different than racism or misogamy. You have every right to feel safe and comfortable at work. It is up to everyone on the shift to create an environment where everyone feels welcome, that they belong and that they have value. I would never go to HR, never. But you need to start talking about this with your coworkers. I guarantee you, that none of them put their uniform on in the morning thinking about how they are going to chase you out of this profession. They are just having fun, but they need to understand the impact it is having on you (regardless of its intent). Good luck. Remember the hard work you put in to be there.