I have never run into this in my four years in DDO. Yes, run into a tool or two, but nothing like this:
Jumped into a Shroud pug yesterday. Good spread of guys, maybe a little light on DPS, but solid enough. Everything is going on merrily until we are about to start part 3. Our leader, a wizzie, said something about wanting someone to come in and do his puzzle for him. One of the clerics said something along the lines of "Geez, pike much." That just touched things off. The Wizzie started going off on him, "F-ing little bi***es" this and that. Cleric was tossing back, but the Wizzie was just going house. It was bad enough where I thought they had to be kidding and were guildies or something.
Things quieted down and we got past 3 and completed 4 in a pretty nice salvage job. One of the fighters started to pick up the lead, so we weren't hearing from either of the two guys who'd been at each other.
Then p5. The fighter, tells the wizzie to keep the Earth eles attention while we clear out the rest. I don't remember the exact sequence of events here, but the whole thing started up again. The wizzie was going off and swearing all over the place. The cleric was on him for not doing his part, but the Wizzie was going amazingly overboard.
Then, after we finally clear out 3 of the 4 bosses and are boxing the earth ele, prepping for Harry someone asks the Wizzie where he was at. As we were buffing for the final fight... after another profanity filled rant he turns out to have recalled, but not dropped group. The swearing got so bad I had to squelch him. Shortly thereafter he dropped and we went on and completed.
Sorry, long story, but I have never run across that in this game. Found it a bummer and wanted to share to see if others are seeing this sort of thing.
From my perspective. The cleric may have been a bit out of line with the piker comment, but he was probably at least half joking... it was the freaking puzzles, who cares. The Wizzie, however, just went off. He obviously felt like he was being attacked, but just handled it very badly.