See, the funny thing is that the ETLs, TLs, and TMs all joke and snark each other on a regular basis. TLs go to lunch with TMs all the time. I don't hang out with them outside work, but two of my best buds at work are the APTL and the PMT. We (softlines) call the SFTL and VML "mom." A lot of us are friends on Facebook. And yes, two of the TLs were favoring some of their pals, but at the moment, most of the schedule is written by our STL, who hates everyone, so...
You can't stop being friends with some of your coworkers, just because they become your "supervisor." That's not healthy imo.