My boyfriend goes out to his friend’s house almost every weekend. That’s okay to me. Previously (ages ago) I asked him to take a photo at their place, and he did, very reluctantly.
Yesterday he went out again, and I asked him to take a photo for me, and he completely refused and ignored me straight afterwards.
He came back today, and I asked him why he refused. After a while he snapped and said, “Then do you want me to just message you 24/7? Just take random pictures while I’m chilling with my friends just for you?”
I’ve told him all the time that if he doesn’t message often, its completely fine, because he is with his friends, completely understandable. But all I asked for was a photo. Is it that bad? Is it a guy’s thing? With my female friends, taking a photo, messaging on my phone seem perfectly fine.
LemonVibe 
Honestly, why are you wanting a photo of him and his friends? Personally I can understand his reluctance as this is something that I think is personal to different people. Some would have no issue with it or even send you pics if you wanted to or not. Some (including myself) don’t feel comfortable doing so and if he is out and trying to chill with his friends it might not be something his friends feel comfortable with. So really question why you are asking him to do so and how important it is for him to do it as clearly he isn’t going to want to do it naturally.
Women in general tend to be more social, but I agree with yeahbutwhatif, some people are very uncomfortable with that, regardless of sex. This comes across as clingy and over the top to me, but you may not mean anything by it. I would chill with your friends when he is with his or find something to occupy your mind like a book, hobby, tv show, ect.
Why are you wanting a photo? From what I can try and pick up from your post, there could be a trust issue maybe? It’s the only thing that I can think of. Maybe you should address that before getting upset that he won’t send a picture.
Some people are comfortable with photo’s, others aren’t. You need to respect that.