I've never needed anything beyond the combination of the whole "I don't do politics, or religion at work", and a blank stare until people go away.
And I was a nurse's assistant, so it was a similar situation, where I was often the only male employee. I didn't learn how to give good blank face until almost 30, though. It's harder to do when you're younger.
Later on, I had to add the bits about sex/romance because, believe it or not, some women will mess with you just to cause trouble. I would add sexual matters to the politics and religion, and just walk away. There's zero way to engage in those kinds of talks as a man in the workplace. It can not end up in a good place.
Now, I could easily get away with the stone face because I'm typically a very friendly, polite, and affable guy. I'm even downright charming at times. So when I drew firm boundaries, it was rare for anyone to take it personally. Those that did, well, they're not the sorts that last at any job.
Now, if it's break time, and we're swapping recipes or other nice things, I was often at my most affable because as much as I actually hate people in general, and get worn out from group interactions, I can fake being an extrovert very well. That's mostly about a lot of listening, laughing in the right places, then offering the occasional bit of conversation to let them know you're paying attention.
Workplace conversation should be casual at all times, no overly personal stuff, no hot button topics ever. If things are that friendly, meet up outside work and get back to the job. Not because of some bullshit protestant work ethic or capitalist bullshit, but because you agreed to do a thing for a period of time, and fucking around while the job is still on is lame.