What does "upsetting" mean?
"Upsetting" is the adjective related to the noun "upset," which means to be unhappy, disappointed, or worried. The speaker has used "upsetting" to express his feelings after seeing the photography hacks, which are so surprising that he feels almost tricked or disappointed. Ex: My cat has been sick for a few days. It's very upsetting. Ex: The argument was very upsetting for the whole family.