Dr. Bilal Philips mentions in one of his lectures that "All acts of disobedience is an act of shirk.” Doesn’t this contradict the following verse: “Indeed, Allah does not forgive association with Him, but He forgives what is less than that for whom He wills. And he who associates others with Allah has certainly fabricated a tremendous sin.” [1]

The ayah is speaking about meeting Allah with major shirk. What Dr. Bilal Philips means is that we have given preference to our desires over Allah's commands or we have done a deed to show off; these actions of disobedience are on different levels of Shirk.

Reference:

[1] [Surah An-Nisa’, 4:48]