I work with a group of girls who have consistently talked shit about my bro who works with me. This job is not serious so I'm not really concerned about getting fired.

However, I told my friend about them talking shit and they found out. Now there is this strange friction within the workplace and I'm not really sure as to whether or not I made the right move here.

I could've either shut the fuck up and proceeded as normal or let the bro know and not give a shit about the workplace environment. What's your guys' opinion on this?