A lot of that seemingly came from when modder = cheater in GTAV. Saw a huge swing to that at the height of that game's popularity.

Edit: Read through the comments and it's related to GTA but in a different way. The guy was comparing bootlegging to modding because someone in his country, Indonesia, was modding GTA:SA to add children's show characters to it, changing the packaging to make it more appealing to children, and then is selling the discs to people. Which is a whole other can of worms.

Anyone else that mentioned they didn't like modding didn't really elaborate.