Yeah, he's going to nag someone to cut it. While he doesn't want it as short as Reiner's, he doesn't want it to be too long.

At the mention of rainbows however, Bertolt leans down just long enough to press a small kiss to Reiner's cheek. "Meet you in the middle with rainbow twizzlers and skittles." Compared to how he was feeling earlier, Bertolt is definitely in a better mood.