AIO for refusing to reconsider ordering food and drinking alcohol at home?

I live in the UK with my girlfriend, and recently she’s been trying to eat healthier and make some changes to her diet. She’s a bit overweight but she’s still pretty healthy.

She’s cut down on junk food, stopped drinking alcohol at home, and has started making her meals slightly healthier. I’ve also cut back on junk food and started choosing healthier snacks but that’s about it.

We were talking about our plans for the weekend and agreed we wanted to keep things relaxed and didn't really want to go out apart from a walk on Sunday.

While we were at the shop, she asked about food for the weekend, and I told her she could get whatever she wanted because I was probably going to order a takeaway.

I haven’t ordered food in a while, and I was craving something from a place I haven't ordered from in months and I grabbed a bottle of Pepsi max to use as a mixer since I got some drinks for for my birthday.

She brought up her decision to eat healthier and said I should put the drink back and skip ordering food. I just told her she’s free to cook whatever she wants for herself, and I’m not pressuring her to order food or drink with me, I’m just doing it for myself.

She said I should be supporting her with this healthy eating thing, and I told her that I am supporting her but that don’t mean making the same choices she is making. I reminded her that her decision to be healthier doesn’t mean I have to change what I eat and drink.

Now she feels like I shouldn’t be ordering food or drinking alcohol at home when she’s trying to be healthier, but I’m struggling to see why my choices have to be affected by my girlfriend desire to change her diet.

I feel like I’m being supportive by encouraging her and most of the week we'll eat the same meals, but I don’t think I should have to give up things I enjoy.

AIO for drinking alcohol at home and ordering food?