To ask how you deal with other childrens bad behaviour

[DuploTower]

Aibu to wonder how other people deal with bad behaviour from other peoples children (in your care, playdates, their parents not around)

Do you have a different threshold for "bad behaviour" for other kids than you do your own? Things you'll ignore in others but you would pull your own up for.

When do you draw the line and call their parents? Have you ever had to, and why

Ive never had to call anyone's parents, but I was always more than comfortable explaining our rules to visiting dc, or reminding them of what is/ isn't acceptable. I mean, we never had any major rules, just what (with hindsight, and watching The Last Leg for a few years), I now know to be 'don't be a dick'.
Depending on age - just remind them what is / isn't acceptable, and then distract. Or, if older, just tell them that isn't acceptable in your house and if they want to say they'd do well to remember that.