Would you like an in-game parser?

[Lambdafish]

No, i don't need some idiot telling me my DPS isn't optimal when i'm just trying to have fun.

Is your DPS "not optimal" or is it "bad?" because if you are doing casual content or even primals and you are clearing them then nobody is even going to bat an eyelid that you could do 100 more DPS, nobody cares so long as the thing dies/the problem isn't damage. People start caring when things aren't dying, DPS checks aren't being met because one guy is doing ~500 dps less than the minimum he should be, and that's the only reason that the fight isn't being progressed.

I don't deny that assholes exist, but if that's your worry, then you are well within your right to call them out on it, they're the idiot who can't read a situation, and they aren't the majority by a large margin. Really, you are denying people a useful tool, over the fear of that.