It's a pretty clear example IMO, but the point is more that people jump at every opportunity to have a go at him, whether he's done anything wrong or not. There's various examples where Ponting had been widely criticised when he's not really done anything wrong, or what he's done "wrong" is totally understandable and would be done by any captain in a similar situation.
Along with the catching issue, there's also the absurd chain of events in Bangladesh that led to him being fined his match fee for dissent. The fine was fair enough because he did effectively complain about a decision, but on here and in various parts of the media both online and off Ponting was criticised far beyond the bounds of what he actually did, accused of bending the rules for the benefit of his team, abusing umpires and so on. All because he complained to the on-field umpire about a completely absurd decision from the third umpire and eventually got it (correctly) reversed. The on-field umpires even said at the match referee's hearing later that Ponting never abused them or asked them to reverse the decision, he just basically queried what the hell was going on, as it was clearly out on the replay.
The fine was perfectly acceptable, but if any other captain with the possible exception of Smith had done the same thing people certainly wouldn't have attacked them for it in the same way, let alone attacked the entire team in the process.
The latest example is, of course, this one we're discussing in this thread.