Disco-Dancing Patrick Swayze Encourages You To Drink Pabst

It seems this 1979 commercial starring Patrick Swayze (and wife Lisa Niemi?) was designed to scare and confuse future generations. Why is Swayze doing Dirty Dancing moves in the middle of a roller rink? How did the hipsters in the background lose the disaffected sneer? And why does the announcer call Pabst “good” at the end?