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Thanks. Yes, naturally, that example is not too polite to start with, if one thinks about the meaning :) My question was mostly just about ～ちゃった vs. ～てしまった.

どうもありがとう。

I wonder, is it OK to say smth like 遅れちゃった instead of 遅れてしまった in polite speech? Does it sound feminine?
e.g.
誕生日パーティに遅れちゃったけど来ないよりはいいでしょ？
(off alc.co.jp)