At the time. Anti disco sentiments are well documented and Off The Wall definitely faced the same complaints from many critics and DJs, especially white ones. In the 80s you can look up a whole host of critical takes on drum machines and synths, claiming the music would be dated or not be timeless like previous music. Prince, Stevie Wonder, MJ, and countless others were using that shyt at the time. And while "80s music" definitely sounds dated to that era due to the tech, today no one could deny most of the major hits and artists of that time lasted the test of time. Speaking of drum machines and synths, the same was said about rap music in the 80s and early 90s. "This is a trend, it's not music, it won't last."
The point is that in every decade there are critics or fans who hate on shyt, or who say music was better a decade ago, or say new music won't last. And they are wrong every time. So why age yourself by joining that group of people?