Nonsense. Now you're talking about two entirely different things. The body slowing down doesn't equate to a fighter reaching his maximum potential. Your initial statement was that a fighter peaks at 29, and we've seen plenty of fighters disprove this notion. Bisping is only just hitting his stride. Evans stepped up his game exponentially in his 30s. Anderson Silva became a dominant force at 31-32. Randy Couture, Chuck Liddell, heck, even Chael Sonnen has been fighting at his best in his 30s. There are plenty of fighters who become the best they've ever been after 30. Of course the body slows down eventually, but your 'prime' can also include the addition of a new skill-set, diet, or training regime.
It's not a hard and steadfast rule as it doesn't apply to everyone. You can call it a stat and namedrop Joe Rogan all you like, but empirical evidence exists that fighters and athletes in their 30s are just as good as they were in their 20s, if not better. And no one is throwing hatred your way. They're simply disagreeing. Stop being so sensitive.