This is quite clearly not a threat, but rather a really hamhanded attempt to retain an affiliate. Saying “leave if you want to leave” and basically implying that one should “suck up” the negative aspects of their program, then passing this off as ok because everybody affiliate program has negative aspects is a pretty tenuous approach to take.
If this is the level of professionalism levied toward preserving an maintaining partnerships you’re definitely better off elsewhere.
Mark Jared