I don't think Idriel was 'angry' with the MC with her talk, though more so disappointed. Mainly because she didn't expect the supposed ending to us. While I do partly agree we did maybe get a bit of a full head and were distracted by pussy (Hey, I need to secure my lineage somehow Idriel), I wouldn't say we were entirely full of out selves. Sure, we were very much improving out skill and abilities, but I don't remember us thinking we could handle Thanatos. I think it was more so being up to the challenge of a rematch with Thanatos rather than 'Oh yeah, we can take Thanny'.
The think with our grown confidence it may have led to some bits of arrogance, particularly with Nova and not focusing on her during our time with her, and being focused too much on the possible godhood than others for the briefest of moments. But at the same time, with the two thugs, they honestly expected us to just bend over and give them what they want, thinking that all Eternum players are just pussys and weaklings. Lo and behold, they we met with the opposite with us. And it wasn't like we didn't warn them to back off. Naturally because we had the confidence to handle ourselves and defend ourselves, with the mixture of self defense lessons with Dalia and such.
But with Idriel, going back on this a bit, my impression was she wasn't truly angry or spiteful but disappointed and surprised about it. As if she entirely didn't expect us to meet our possible end there. Out of all the outcomes and possibilites, this wasn't one of them. So as such, she 'blames' us for our 'arrogance' and 'being distracted'. As such, given how we seemingly have been at this for quite a while according to our beloved Tempest (Idriel), she very likely has seen our past lives and possible deaths and likely foresaw them before. This time though, she didn't.