SAS is one of the biggest kobestans of all time so of course he will say what he did. The media has always fueled the idea that Kobe was like Jordan and would take and make game winners with ease. The facts never supported it, the numbers never supported it, but it was repeated nonetheless.
LeBrons perceived lack of clutch is always well covered by the media. You still have people running to recite numbers from the 2011 finals and they ignore his presence and performance in 3 championships and five finals appearances in the five years since.
Has nothing to do with Kobe. That perception that lebron wasn't clutch was built up by skip and lebron's performance in 2011. It's one of those narratives that will kind of always stick to him unless he does some brazy clutch shyt this June like hit all the game winning shots or something. The hate lebron got in 2010/2011 left that little blemish that, even though he won 3 after, will always stick with him to some extend.
Now as far as kobe. It's the people that kept calling him clutch and the media ran with it. GMs, players, lakers fans all made "mamba mentality" what it is. Kobe leading in game winners with 36 fielded that no matter how much he missed
Back to lebron, it was his actual play, skip bayless, dan Gilbert and social media that ran "lebron is a career choke artist" and those 4 quarter jokes. I remember even bytches who didn't even watch ball didn't like lebron. From 2011 up until he won the next year the 4th quarter jokes ran rampant on twitter and was apart of that first wave of social media memes. One of those all star games he passed on the game winning shot to deron Williams and cause a turnover I think. everybody was roasting his ass on social media. Little shyt like that made lebron a target.