We're all close friends in my H2H league, so I will from time to time make a comment. However, I don't name the manager, nor do I name the players involved. I do something like this "Please stop making dumb ass trade offers. Thank you." Or, my favorite things to do is fake like there's big demand for one of my players with hopes of soliciting offers. Like -" Hmm, Arod? I'm not insulted by the offer, but I may need another player thrown in to make it happen." Then I watch how many offers I get for Arod.
I can do all of this because we're all long time friends, however, in my roto league, I only know 3 of the 12 owners, so I don't make a peep there.