what ARE we allowed to be judgy about?

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according to MNetters, we shouldn't judge parents who let their children get tattoos; people who let their 14 yo dd sleep with a boyfriend;people who don't give up their seats on buses; people who feed their kids shite day in and day out;people who are happy to live on benefits when they are capable of working..teenagers who go off to Syria to join terrorist groups..... the list goes on.
is there anything acceptable to be judgy about or is every lifestyle choice acceptable and no comment should be made

You can judge whatever you like.

The key thing is knowing which of your judgements should stay firmly in your own mind.

It's 'judgemental' not 'judgy'! Why is this term used so much on Mumsnet?

It's a colloquialism.

Terry pratchett wrote in one of his books you have to judge (people / situations) first before being understanding / forgiving or.else you don't know what you are being understanding about.

Everyone makes internal judgements favourable/non-favourable every second of the day. What you do with that judgement is up to you. What I do not like is people hounding other posters and saying cruel things.

I judge non-judgemental people
I love to judge, because I'm so perfect obviously