Is it okay/acceptable/normal for you to torture insects?

Some guy friends of mine love taking flies and cutting their wings off and torturing them. It makes me sick to my stomach. Just cause it's a little insect doesn't mean you have the right to torture it for your own pleasure. I understand if it's a life threatening insect but honestly if you want to kill it, then kill it but don't put this little creature in pain for a long time just to have fun. We will never know for sure if they do feel pain or not, whether they have nerves or not. We won't ever know. I'm disturbed by it.

so my question is do you think it's normal to enjoy it to torture insects? Do you do it? If so why?
Is it okay/acceptable/normal for you to torture insects?
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