I tend to say "nh" or "wp" when I actually mean it (which is most often going to be on a CC freeroll or against someone I know otherwise), when they show up with quads or better, or when the fish hit his miracle card to suck out.
I'm always nice to the fish. Can't stand people berating the fish for their bad play. Feels like the ones doing the berating don't know where the money comes from.
Unfortunately it's very hard to respond to them without inadvertedly calling the fish a fish. Can't really say stuff like "don't insult the fish" or "don't tap on the fish tank".
And I'll always say "ty" when someone says "nh" to me, and "gg" when I get busted or I bust someone. Common courtesy, imo.
In the CC
freerolls, especially with members I've built some rapport with, I'll generally say something along the lines of "ouch, sorry" if I get it in as a big dog but suck out. Especially if - for a split second - I had resigned myself to being booted from the tournament.
I hate using "ul" because to me that reads like "u lose" rather than "unlucky". I hate it when people say that to me as well for the same reason. Feels smug.