No, for real. C'mon, Serge. You are just kind of trolling, right? Well, at the risk of feeding the trolls, some disinfectant:
James held opposing power forwards and small forwards to well-below-league-average effective shooting percentages this season, limited both to pretty sound scoring marks of 17.3 points per 48 minutes this season, and allowed sub-par per-minute Player Efficiency Ratings of 14.8 and 10.3, respectively (thanks, 82games.com). So, guys he defended produced at worse-than-league-average levels this season.
Plus, Heat opponents posted higher field-goal and 3-point percentages, turned it over less frequently, and scored at a more efficient rate when LeBron sat than when he played (thanks, NBA.com's statistical analysis tool). The Heat's defense was still good when he was off the floor, giving up an average of 97.3 points per 100 possessions, but it was better when he was on it, at 97-per-100.
He also gave up fewer points per possession as a primary defender than Ibaka did this year (0.83 to 0.87), and allowed opponents to score on a significantly lower percentage of possessions (36.5 percent to 41 percent) than Serge (thanks, Synergy Sports Technology)? And he edged Ibaka in defensive rating — an estimate of how many points an individual defender allows per 100 possessions — by one point-per-100 (thanks, Basketball-Reference.com).
Basically, any way you look at it, there's not really very much support for Serge Ibaka saying that LeBron James isn't a good defender. He is good. He's really good. Very legitimately deserving of being named to the league's top All-Defensive team four straight times, and of being the leading vote-getter this year. Fewer crazy pills for Serge Ibaka, please.