Omg in that thread you linked, there was video of Yoona getting booted out of Taeyeon's car. lol
I think part of the reason why Jessica's fashion label was a problem is that it made it hard for SNSD to endorse other clothing companies? Not sure about this one but that's something that was going around was that if SNSD had one of their own sunglass brand or a fashion brand, then other companies wouldn't want to hire them.
I think Taeyeon does have kind of a snobby attitude.
I also don't like this Tyler Kwon guy. I think he's sketchy as heck. There's another article floating around somewhere that just came out that said that he is investing in Jessica's company, but then if Jessica's company fails, then Jessica will owe her investors $40 MILLION!?? O_O