Waste difficulties

From last Summer.

I've alluded to my wanting to avoid as much waste as I can, particularly of the plastic type.  This, in some ways, is going very well- I've become a lot more organised in preparing for the situations that might need me to use something disposable and manage to avoid having ALL the packaging.
Here are three situations where this has worked.
1.  Macdonalds last week- I asked them to put my chips and burger (I have the one in the paper) in my Lock n Lock box.  I also did the same in Macdonalds at a service station at New Year and KFC after school too (I have to eat on the go on my way to orchestra so I have to grab something takeaway)
2  Taken 3 enamel mugs to my orchestra rehearsals in January which meant CBC, myself and my friend Izzie have not had to use the polystyrene cups the orchestra provide.
3.  Carrying my spork, stainless steel straw, insulated mug, plastic container and paper bag around in my rucksack means I haven't had to take take any disposable items - my friend Izzie took her left-over chips and mushy peas from the chipshop restaurant home in my plastic container so she could eat them today.
But, I had a moment today which I don't think I dealt with well and I wonder what you might have done as me.

We went to Wagamamas for dinner and I had ordered a raw juice. When I saw them serving someone else's, I saw they had straws in so I quickly went up to the bar and asked them if it would be possible to have my drink without a straw. She said they were paper,if I was worried, but I still asked if I could have the drink without one.  The girl behind the bar said that was fine. 
When our waitress turned up with our drinks, there were straws in the drinks.  I said, "But I asked not to have a straw.".  She said she was sorry she didn't know - she said she could take it away and I said yes please. CBC said to me that I should just take it now since they have put it in the drink and said I was being obsessive over it.    But that's not the first time it has happened- I've asked for no straw before and been bought one in my drink.   When the waitress came back, I said to her, I wasn't annoyed with her, but it was just that I had asked at the bar, for them not to give me straws. 

The point is, I wondered what you would have done in the situation?  Would you have kept quiet and just used the straw? I'm still not sure- I feel like I wanted to say something but perhaps I need to develop a way to say it where my anxiety over it doesn't make me come across in a way I don't want to come across (if you know what I mean?)

xx