So I’m not even sure if this works here but I need advice

So me and my girlfriend have been together for a maybe a couple of months and recently I’ve just started to get upset at the way she talks to my friends. She’s so chatty and energetic when talking to all my friends but when she talks to me it’s so much quieter and like she doesn’t even wanna be there. Recently we were walking around and she was basically silent and hardly engaging in my conversation and then the moment we ran into a friend she perked up and began initiating conversation and seemed a lot happier. When I asked her about this she got mad at me saying that it’s “comfortable silence” and that I shouldn’t even care how she acts around other dudes coz we’re dating. 

Is it wrong to be upset at her over this kind of stuff?