Snoop is doing cooking shows with Martha Stewart, he's been trying to sanitize his past for 10-15 years now. But by doing that he's making it seem like everyone else was doing dumb shyt, not him. And the biggest cautionary tale of that era, is BIG and Pac. So he keeps going back to that well.
Alongside that, I'm sure there's some animosity towards Pac because he essentially derailed Snoop's rap career. Snoop went from #1 on Death Row to a distant #2, everyone got moved to the side. Albums got put on hold, beats and songs got repurposed, etc.
So I'm sure on some level Snoop felt some kinda way about that. Hell, he might subconsciously be shytting on Pac because that was never resolved. When Pac died they weren't on good terms.
Fred.