If you haven't noticed it, then I'd suggest you weren't paying too close attention over the years.
Obviously none are gonna come out and blatantly say it on the record. But, if you've been playing attention, the pattern's clear. During the Tubby years, Pitino's ex-players were quite outspoken as part of the UK family, but right after Cal was hired, plenty went silent, or changed their tone..
In some cases, it's explainable because guys who'd actually gone to work for Pitino (Walter McCarty, Steve Massiello, etc), or in some cases, guys who just inexplicably took passive aggressive shots at Cal's players (I believe Sean Woods, Derek Anderson, Jeff Sheppard, are a few who've done so), or nonsense (as a prior poster noted) like the 96 team making an unnecessary stink over their anniversary rings, or the obvious body-language snubs of guys like Pelphrey (I don't think he's even even looked at Cal's face during the obligatory post-game hand-shake in the last decade).
Those are a few examples that immediately popped in my head. There are others, but I've not the memory, energy or effort to pull em up now. But the common denominator seems to be Pitino recruits. Our guys from before Pitino (like Bowie and Walker) seem to love Cal, as do our most recent guys. It's only those Pitino-era guys who seem to have issues.
Which is a bloody shame because I loved those guys.