@32oiru
That's assuming they're equals, they're not, this fucker has a ton of mana and can clearly block attacks, they talked for quite a while and while he THOUGHT of useful things to say, he never spoke them.
Of course, I think those two wouldn't have believed him and things would've turned the same, but the fact that he didn't AT LEAST TRY to say the useful things HE WAS THINKING is what's ticking people off.
I hate this manga trope, where the MCs think of completely articulate explanations, but when they open their mouths, they say something vague that could be interpreted as something else, it's bullshit, that's what pissing people off.