He recently had a V live to talk to his fans. He was talking about JB and Jinyoung's JJ Project as well as his upcoming solo song when a hater started spamming, "Leave GOT7 and come to China" in Chinese.
When he saw the comments, he spoke in Chinese and said, "When I do some things, a lot of people like it, but also a lot of people don't like it. Hate comments just make me stronger. To all the people who don't like me: I'm going to work harder and become stronger. Every time you write hate comments, I work harder. Thank you."
He then said in Korean, "I'm just going to work hard as GOT7's Jackson, and succeed as GOT7's Jackson. A person's mouth is their own, and you can't stop what they say. So I don't really have anything to say against that. I just have to keep working hard as GOT7's Jackson. I'll work hard and succeed."
You can see his reaction at around the 19:40 mark below.
We need to be respectful even when our identity can be hidden on the internet. This anonymity does not permit the use of hateful and negative words that harm others. Let’s be mindful of how we are using the internet.