It is laughable that people hate Calipari so much. He over took Kansas and UNC in all time wins.
UK first took the overall lead in all-time wins around 1968, which was around the time they were the first program to achieve 1,000 victories.
Since then, they have held onto the lead except for a few years in the early to mid 90's when UNC overtook them. But since 1996 UK has been in the lead. So it's incorrect to say Calipari "overtook" Kansas and UNC. UK was in the lead when Cal took the job, although as already noted UNC was extremely close at the time UK hit 2000 victories.
Again, for anyone interested in seeing how the all-time wins race has fared over the decades, they can check out the following page. There's a lot of unexpected names of schools that were in the lead or in the top 10 at any given time. For example Temple, Yale, Fordham, Penn, Washington, Kansas, Oregon State, Kentucky and North Carolina have all held the overall lead at one point or another.
All-Time Wins Leaders over the Decades