First, it's probably best to remind everyone, on both ends of any conflict, that your IC beef should not be making you upset OOC. That's a tall order since the game is very high stakes at times, but it's best to remind yourself that appropriate in-character insults are directed at your character, not you.
Second, I have seen a lot of IC insults that insinuate some level of OOC wrongdoing in others, which makes the first point difficult to stick to. Mainly, I see a lot of things said along the lines of 'you do nothing', and this has been a fad that's outlived it's welcome by a large margin. It doesn't make sense from an IC standpoint; if a character is bad at their job, say that. If they're bad at running events, say that. If they're bad at networking, say that.
The catch-all 'do nothing' is oftentimes a quasi-IC callout that insinuates a player has nothing to offer or contribute to the game at large, and that's not cool in my eyes. It's completely nonsensical from an IC standpoint, as I have never heard even the most vitriolic people in real life use 'you do nothing' as some kind of insult. It is bringing up some imaginary OOC scoreboard of waves made, instead of attacking the IC qualities, flaws, or actions of characters.
Can we all agree to do better? I sorely miss seeing IC toxicity that felt IC and themely. If I'm overreacting from the sidelines, maybe the thread is not necessary after all, but I'm hoping this reaches the right ears.