Jesus Christ said these telling words. And he supplemented them by also saying that his followers would be persecuted as he was persecuted. Jesus's disciples were persecuted in the first century by a bitter wave of Roman persecution. They were also probably maligned and had false rumors spread about them too. Cases of immorality in the congregation were no doubt blown out of proportion too. A man in Corinth was allowed to live with and have sex with his father's wife for a period of time. What reproach he brought upon Jehovah's name. Paul took care of things dough.
Some christians were also accused of sleeping with their sisters or brothers. These rumors were false, however, and Christianity continued to "rise."
So today. People may persecute jws and make up stories about them or exaggerate shameful acts that do occur in jw camp. But we expect this kinda treatment. We will rise in spite of it.
"[We] rise, [we] rise, [we] rise."