You sure told him. Nevermind the fact that people are actually selling wins, asking people who aren't interested to lose to them on purpose so they can get more points, etc. But yes, it's definitely those scrubs just complaining that people are better.
There's a person in my FC who whispered someone from the Triple Triad LS I'm in and asked them if they would be willing to take a dive for them, then begged them not to tell anyone after the person said no. Unfortunately, this is probably the least abhorrent thing she's done in FFXIV.
Not everyone is going to be a cheater who gets on the leaderboard. But there's definitely the potential for them to be, and that problem needs to be addressed.
