Honestly I feel like the whole bit you're doing is kind of completely out of left field. The only thing that was actually said to Gojira was 'Hey, how about we don't fight in here?' and her immediate reaction was 'GRR, you're all terrible for talking to each other in a social setting that I chose to enter! let's fight in here!!!!!' which combined with attacking MUTO while they screamed 'WHYYYYYYY' makes them seem just...kinda like an unstable rage monster but I'm not sure if that's what you're going for?

And anyways, if you really wanna do a fight thing super-bad, you could at least listen to the suggestion and move it outside the enclosed space full of civilians. That could potentially all be annihilated by nuclear fire. Perhaps a foolish thought but it's there XD.