If he's too young to understand, he shouldn't be on a forum where "grown men and women, and young adults with teenagers" hang out, but should look for a forum "suited to his age."
Before attacking others, think not only about whether it's right, but also whether it's necessary?
Yes, everyone disliked that someone created a thread saying that the first and second Heroes games are the worst.
Just call the topic "Games I Don't Like." Ask someone from the administration. I think it's possible to do that? This will show you that the title "5 Worst Games" doesn't relate to the overall topic.