I'm sure they appreciate the free advertising lol

There are certainly situations where if you want to make progress you have to speak up about what needs to be improved. I personally am overly critical of myself, if I screw something up everyone will know by the obscenities coming across their speakers lol. But a lot of times people simply don't realize they are messing up or that they could be doing such and such better, or they simply play it off hoping no one will notice. So you're only hurting yourself, and the group, if those kind of things aren't discussed. It doesn't have to be hateful or callous, and most of the time it's not. I would say, however, the closer you are as friends outside of raid, the higher your tolerance for trash talk will be.