Don't much have a problem with people opening my bottles that I bring, but I can understand if others don't want their bottles touched. After all, it probably took a lot of trade baiting, muling, and manipulating to obtain their prized bottles.
I just know that awkward beer nerds can definitely embody the "give an inch, take a mile" mentality, based on real-life experiences and stories I've heard of shares being held at people's houses, where they got drunk and gave consent to open "a couple bottles"...and the guests ended up basically raiding their cellar.