Would this be rude?

I’m afraid that you are coming across as “that girlfriend”. Why don’t you just order a couple of dishes that you can eat off their menu this time and perhaps suggest another place next time. For the first takeaway night, I probably wouldn’t be making so much fuss.

That would be rude. Your hosts have invited you so to say their choices aren’t good enough is disrespectful. Don’t order elsewhere, you won’t come across well and it’ll likely offend them.
So you can either eat beforehand so you’re not hungry and just have a few token items so you can eat something. Or just order starters which are veggie. Plenty of people prefer Chinese starter to main courses so that won’t look as odd.
Or choose from the wide range of Chinese foods that don’t contain meat as PP’s have said.
You’re risking coming across as entitled and difficult otherwise when you’ve been invited to spend time and share a meal with people. They’re the hosts, they get to choose where they order from.

It would be rude, but I also wouldn’t eat from there. I’d speak to your DP and explain, and work out a different solution

TBH they sound rude and inconsiderate, and actually a bit bonkers or scabby to order from somewhere with only a 3* hygiene rating. Bleurgh. YANDBU to get your own, and who cares if they think it's rude? If they do then they aren't worth bothering with or gaining the good opinion of anyway.

That never happens when one person is veggie and the rest are omnivores. The vegetarian keeps her own food.

OP, in my many years of scoffing Chinese takeaway as a vegetarian, I have never come across one that won't do a bean curd version of the main dishes. They often don't mention on the menu in my parents' small town takeaway, but they do it.

On food hygiene, I agree with you, I never go to anywhere rated 3 or under. But it's chicken or rice that are the biggest risks, so order a veggie noodle dish and you'll be fine.

You didn’t. Comprehension…

I was asking about the scenario. What if everyone wants a spoon of your vegetarian noodles and leaves you with very little to eat. How will you feel about it?

Obviously the OP’s dietary requirements and comfort are the most important thing? I’m baffled anyone would think otherwise and wouldn’t hesitate to order my own thing in her situation. I wouldn’t feel the need to ask advice on MN beforehand either because it wouldn’t even cross my mind anyone would have a problem. And if they did, that is their issue to deal with.

I don't think it would be rude.
You could just say something like you've been thinking of Chinese since it's been mentioned and really fancied a certain dish on the other menu that theirs doesn't have.
Nothing about the hygiene etc ...

It wouldn't bother me at all.

Typically with such meals, the dishes are all placed in the centre and people take from each. How will you ‘police’ your dishes at your hosts house? Poor form to deny others a tasting in order to ensure you’ve enough (because you’re not eating the other dishes).

This! Why would it matter? You’re not inconveniencing them in any way, you’re paying for your own order. The kind of people who’d actually care about this need to unclench. Do what you need to do OP it’s fine.

You’re jumping down people’s throats just on this thread. Don’t ask for opinions if you don’t want them.

I’m guessing it’s the food hygiene rating more than the limited veggie options?

Could you show your partner the reviews and the food rating?

Yes it would be rude - maybe just have some egg fried rice and say you are not feeling that hungry.

What is your partner saying though? They could try and help you out a bit and steer them towards a different takeaway.

It’s a bit of a faff ordering from different places as the food will arrive at different times?

Stir fried veg, egg fried rice, veg spring rolls, veg Singapore noodles, crispy seaweed, salt and pepper tofu, broccoli in garlic sauce...there's loads of vegetarian things from the Chinese?

To be honest, the protocol for this would be literally order a couple things you know you can eat, and help yourself to a portion of each. And that's it really. If you start claiming you want food from elsewhere the family could think you awkward or be insulted.

I also agree that it would be rude unfortunately. There are things you can eat. It's about the shared experience. It would actually be better not to go than start ordering from elsewhere. I'm vegan so have sympathy with trying to pick from very limited options but it's just not socially acceptable. It's like saying I'm better than your food. Vegetarian food is quite difficult to spoil so maybe go for something plain. You could also have a snack beforehand so that you can just eat a smaller portion if you're struggling. 3 is not a bad hygiene rating the inspectors can be quite picky

I’m sure they would want you to be happy thought I would if my DS’s girlfriend came over for a takeaway. Can your partner suggest the different place without saying specifically you don’t want to order from the Chinese.

If they aren’t fussy then they may be happy to switch. If they are I think you have to suck it up and just order something safe like noodles and vegetables.!

I don't think it would be rude. If the one they always use doesn't have anything much for you I think it's fine to order elsewhere. What does your partner think?

Agreed. What’s more important, getting on with everyone or taking a stand?