1) Don't take my picture
2) Don't post my picture on the internet. Anywhere, much less Facebook.

Realistically, I'd probably be more annoyed with you for wanting to do actions 1 and 2 referenced above.

Some people dont like having their pic taken...ever. I'm like that myself.

Not at all. It’s their choice entirely and I understand it completely.

I hate having my photo taken but I don't think that's unreasonable as a one off.

I hate when people take my photo so i understand her

Some people don't like to have their picture taken. People have a right not to be photographed.

I just don't understand what the problem is

Some people don't like to have there pictures taken for one reason or another, maybe they don't think they look good enough, people may have told them there ugly growing up, or they don't want there pictures on the internet, it could be many reasons,