Guys, why do men lightly touch women when they say “excuse me”?

Before you come at me saying I’m some crazy feminist or justice warrior, I genuinely don’t care that men do this. It’s something that happens to me, but whenever men say excuse me, they’ll lightly touch a woman’s arm or waist. I’m not saying women don’t do it, but I mainly see it in men. Why do guys do it?
Guys, why do men lightly touch women when they say “excuse me”?
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