I hate it when that happens... I also hate it when people park in parenting and disabled parking spaces and their kids are school aged or older teenagers and they don't even have a pram or carseat in their car...
I give those kind of people such dirty looks and talk really loudly where everyone can hear me about how stupid and bad they are lol I get a kick out of it and they get all embarrassed!
And then there's the people at the major shopping centres who drop their kids of at kinder/day care in the morning and park in the parents with prams car parks while they go off to work and leave the car there all day!

Most shopping days (only once a fortnight currently lol) I walk the 1.5km down to the shopping centre anyway, even with these supposedly unstable ligaments of mine lol otherwhise I would never get any exercise since I'm supposed to be on couch rest again lol