I had a countryman last night whining about not getting a six call.
What he, of course, didn't realize was that even if I had seen him, I'm a lefty. I've never gotten used to, and don't use a hat switch, so, my left hand's on the JS and my right is on the num pad keeping my enemy's in sight. All my JS buttons (and hat) are mapped to things like fire, flaps, trim, zoom toggle and other things I need in flight (no room left for check 6).
I'll give checks if I can but when I'm rolling around with a con there's no hands free.
It might have been the same situation with those you thought were using you as bait unless you all were flying straight, or maybe they don't know where the check 6 key is. Regardless, I try to think the best of people, TRY not to whine too much, and don't rely on anyone else to check my 6 (If I get one it's a bonus).