I know exactly how you feel. I had gone to the Microsoft store at a local mall to pickup some Surface Pro accessories and walked out with the bag with a big Windows logo on it. I then had to go to the Apple store just upstairs from the Microsoft store to pick up some other things.
Walking around the Apple store with the Microsoft bag I felt like all eyes were upon me! Probably just my imagination, but it did feel very awkward to me.
I could've gone to the Apple store first, but then would've stuck out in the Microsoft store with an Apple bag. No way to win in this situation unless I had dashed out to the car in between trips, but I'm far too lazy for that!
Don't worry about it - last time I went into an Apple shop I was just stood there with my Note 3.