I'm honestly really happy with this development. A lot of times in mangas (mostly yuri), whenever someone gets jealous that their friend/girlfriend are getting close with someone, the friend/girlfriend gets all mopey and feels bad about it, so they end up apologizing, followed by the jealous person apologizing for being jealous. This just has Chidori being rightfully pissed off at Nanoha for bring immature. It feels realistic, especially since they're teenagers, so I'm on board with this "drama"
Also, I really hope Mai gets a gf soon. She has a good heart being nice to Chidori, even though she loves Nanoha.