Exactly.
DH and I ate at The Kitchin a while ago (Michelin starred in Edinburgh). It was a treat for us and it was lovely. Seated at 8pm.
There was a table across from us with three children plus parents. At a guess I'd say they were maybe 4, 6 and 8. British (I could hear them, they had southern English accents).
They were impeccably behaved. They chatted nicely amongst themselves. Mum gave the younger two colouring books whilst they waited for their food, you didn't hear any more from them than you did anyone else in the restaurant and far less from them than the obnoxious chap at another table who was loudly pontificating about the different wines. The little one knocked his drink on the floor and Dad was out of his seat mopping it up and apologising to the staff for the mess and (the next table for the disturbance) before they could get there with a cloth and they're super speedy attentive there! It was a long dinner too, set menu with lots of little courses.
I'd have been bloody furious if we'd gone somewhere lovely like that, arranged childcare and spent a bloody fortune on an evening out only for it to be ruined by ineffective parenting. Because it's not ruined by 'horrible' or 'feral' children, it's ruined by shit parents who are too lazy and selfish to consider those around them.
Clearly these children have been raised to know how to behave in a nice restaurant and the parents were 'on it' and considerate. They looked like they all had a lovely evening together.
No way would I take mine (6 and 4) somewhere like that at the moment at that time of the evening. Lunch, possibly. They'd be tired and whiny later and although they do behave nicely when we eat out (because I've done it since birth, prepare quiet things to keep them entertained like colouring etc and don't tolerate bad manners/poor behaviour especially not when it affects other people in public) we stick to more family friendly places when we're with the children. I don't mean places like McDonalds or places where they're free to run riot - what sort of an example is that? - but chain places where it doesn't ruin someone else's entire evening if one kicks off and needs to be taken out.
Oh and I should say too, one of mine is autistic with with additional needs. I absolutely realise that not all children with additional needs are capable of sitting nicely at a table, or being quiet etc etc it's doubly hard for parents with children who need extra help and support. We are lucky (because it is pure luck, not anything that can be taught) that my child is capable of having that understanding. But if I can teach her, and her younger sibling to behave herself appropriately and have the insight to realise myself that there are some places that it's just not considerate for me to take them if they're not likely to behave on that occasion then I don't see why other people can't.
If you want to be pedantic about it, I'm able to take my child to any restaurant that isn't designated child free and asking me to leave if she were to make noises (including banging the table, can be a stim) or have a meltdown is tantamount to disability discrimination. Disability is a protected characteristic in law and stimming/making noises/having meltdowns happens as a direct result of her disability. I'm basically entitled to take her somewhere nice like La Gavroche for example as they allow children and she could make loud noises, leave her seat, use an aid that makes a noise (tablet), bang the table repeatedly, hum loudly, flap about, even have a meltdown and it'd be tough shit. I don't though, because I'm not a selfish, inconsiderate dick.
For this reason also I do not judge parents who let their children play on tablets when eating out as long as they're quiet in volume or the child is wearing headphones (some children can't tolerate them, others love them). We don't do that because we don't need to, but I totally understand why others do (we do take ear defenders in case they're needed). For some parents that's the lifeline that means they get half an hour to eat a meal that for once they haven't cooked and their child is settled and happy (and not disturbing anyone else!). Again, in a fine dining place? I personally wouldn't have an issue if it wasn't disturbing people but I wouldn't like to. In a Zizzi's? Crack on. I hate it when I hear people talking about children being on tablets in a derogatory way - for many they're essential and you can't tell by looking who needs help and who doesn't. Children even have use of them in EHCPs! No, in years gone by children didn't have them but in years gone by children with additional needs or disabilities were also locked away so I'd much rather have it like it is now!