Hey, if they can sleep at night sending people out with hero licenses instead of keeping that stuff under wraps, they can handle an angry letter or two!

[He makes no promises about it not devolving into name calling by like, the second paragraph though.]

But hey, maybe their bad guys have some weird union bylaws going. "Hey, only try to off the heroes when they're on the clock! No costume, no revenge!"

[He's not paying Aizawa too much attention at this point- if only because he could hear one of the roller coaster's come to an abrupt stop. So he's gotta table that tangent and hop up to a better vantage point to make sure the cars are all empty- it may not happen often, but hey, turns out he does know when to shut up...it's just under very specific circumstances.]