I wouldn't say it's animosity. I just think they're sort of lame copycats. For fuck's sake man, they stole YC's application word for word. I think that gives lifetime exemptions to those of us calling them a me-too act.
I'm not knocking TechStars for doing a similar thing. I'm knocking them for copying it line by line (often by cutting and pasting) and not innovating at all. Good businesses often borrow ideas from successful competitors, but they never copy them entirely. They always seek to improve.