I often bring my own bottle of fizzy drink when going to someone else's house for dinner.
There's been a few situations over the years where I just don't know the host enough to know if they'll have a fizzy.
Anyway, I'm off to MIL's for a dinner tomorrow night and H questioned me in the car, saying 'Oh you're not bringing a bottle of drink are you? People must feel really uncomfortable'.
I said I am! It's what I like to have with my food. He just looked very 
Am I really rude to do this? Is it some unspoken etiquette? If it helps, I don't announce it's for sharing but I do always say 'Got this with me, you're welcome to some' to the person standing by whilst I put it in the fridge