For me, it was when they removed the Linux capability from the PS3 (or technically, they removed the ability to have it be able to run Linux and also use it to play PS3 games). I wasn't personally affected by the rootkit fiasco as I was pirating music back then (I mean I still do, but I did back then as well). I should have taken that as a warning as I was fully aware of what kind of company they were, but was attracted by the shiny PS3 games. Nowadays, I mainly play games on my SteamDeck and do appreciate Valve's treatment of customers - the hardware is mine and I can do what I want with it such as easily upgrade the NVM drive (I'm glad I put a 2TB disk in it back when the prices were lower).
I wasn't affected either as I had given up using Windows already but it hit No. 2 son's machine. I decided that the intent was more important than their technical incompetence.
I did buy a Sony ultrazoom camera recently but that was a secondhand purchase. The hardware is brilliant but as usual the software ranges from barely usable and to totally broken. In theory it is supposed to be able to run a wifi hotspot that lets you transfer images wirelessly but instead of just putting a minimal web server on it they created their own opaque protocol, the only client was Windows only, and you can no longer download it. Had I bought it new in the expectation of being able to unload it wirelessly I would have sent it back for a refund
I didn't take the hint then but I also will never buy any Sony product ever again. I have two headphones from them. Both noise canceling. When the model year passes they push one final firmware to make ANC shit. Then they deny it. I thought if I got the fancier one I would be OK but it doesn't turn on anymore. Very comfortable ear warmers. (Simple shitty solder without support probably. Gotta open it up and look sometime.)