That is fine. No argument there. 
For a single guy or girl, these activities you mentioned are really not so apealing and in fact boring. The reason is that the person wants someone else to acknowledge the achievement he or she has in his or her life.
OK. The person did a great job in climibing the rock. So what? Strangers saw it, but not anyone who is close to the person and the person will still feel empty doing the effort.
Same goes with watching movie or theatre. Unless there is a company, other people will see the person as being weird, nerd or whatever. Even a man would feel awkward going to movies, theatre, opera alone.
Every person needs a company to to go out and enjoy these kind of activities.
Admittedly, men have somewhat more latitude to go out as single and do some of those activities.