Would you call someone out if you see their behaviour towards a minor is inappropriate/unacceptable?

I have done called people out for their wrong behaviour. Be it their creepy behaviour or them raising their hand at their partner or someone in public. I cannot just see that and stay quiet.

Recently I've had an argument with a friend over a creep whose behaviour is very inappropriate towards minors. I said his behaviour is getting worse and I'll call him out for it. She disagreed and said that since it's not my problem, I shouldn't get involved. (I'm confused.. Why did she tell me about the guy's actions since she knows that I can't overlook things.)

So, I'm confused whether I'm being wrong here or are there other people who thinks it isn't wrong to call someone out for their unacceptable behaviour towards kids?

Would you call someone out if you see their behaviour towards a minor is inappropriate/unacceptable?
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