Cuppa for the workers?

So I have some workers putting some tiles on the wall in the bathroom. Should I offer them a cup of tea. I know how to make tea but I have no idea if they will like it and I'm afraid they are going to hate it and I'll be known as the damn American who can't make a proper cuppa.

I'm playing the clash at the moment to symbolize that I understand the problems that worker class is facing in England. Plus if I decided to offer them tea and they hate it, they can't bloody well kill me because they will know I like the clash and I might actually fight them.

I'm also unsure if i should hang around them or be in my room or the kitchen. I'm not sure if they want me involved or not at all.
This is too much stress!