Kaji may not like the man's demeanor but he is luckily not as confrontational as he was before Haruki helped him change so much in his life. So he just gives a short laugh.

"Testy, aren't you? Everyone's in good spirits from the concert, who doesn't love great music?" He does reach for the bypassing tray of drinks, snags one, and holds it out to Tomura, he obviously needs it.