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An apology (in advance or afterward) doesn't absolve you of responsibility. And if you feel the need to apologize for something in advance, that's a huge clue that maybe you should stop yourself from doing the thing you've just apologized for.
Ok, sure!
As for the rest, "excuse me if I'm wrong" is a very common and valid phrase, though a bit ruined by sarcastic misuse
I attempted to show with it that I don't assume anything or default to hostility, though on a different occasion you'd yourself probably argue that others feelings are not my responsibility.
I'm not sorry for asking the question, unless t0mas88 got offended by it.
It's a great level-up for characters of most alignments.
The commenter himself didn't seem hurt by it.
I'd recommend raising your outrage threshold. I clearly am keeping this light hearted, while you go into fight mode because you saw the word "offence". Loosen up a bit :)