More knowledgeable Christians should never mock or disdain weaker believers, nor should they become stumblingstones toward these brethren.
The apostle Paul wanted to educate the Corinthians concerning the deeper things of God; however, he was unable to do so because of their inability to grasp such spiritual truths (1 Corinthians 3:1-2). These believers displayed a carnality like none other found within the scriptures. As a result of their carnality, they also exhibited envy, strife, and divisions (1 Corinthians 3:3). As their boasting concerning the individuals they chose to follow escalated, the divisiveness also increased. Some of them boasted of following Paul, while others boasted of following Apollos (1 Corinthians 3:4). They were full of pride and Paul had to enlighten them concerning the foolishness of this strife. The strife birthed from pride yielded a foolish behaviour. Strife was all the evidence Paul needed to rebuke these believers concerning their carnality.
