What a ridiculous video that's reading way too much into a silly 5 second clip.
Bill Gates may be competitive, but this specific event, and the whole idea that it somehow represents a shift, is completely unrelated to the current topic. People have different private and public personas, and even present different personas to different people. This is completely normal, and often the only way to cope with being a celebrity, especially for introverted personality types.
Way to assume what my attention span is.
Speaking of which, if you watch the (nearly) full interview[1] instead of that 5 second clip, you'll realize that the chair jumping bit had nothing to do with the reason he walked out of that interview. I couldn't find the full version, but you can see that towards the end he gets annoyed at the constant prodding to get him to admit some wrongdoing. The entire segment is made to portray him as some out-of-touch rich guy and tyrant that abuses his employees and competitors. Just poor television all around, more interested in promoting sensationalism for engagement purposes, than showing an honest image of the person. The chair jumping bit is proof of this, given that it's the only thing the public remembers.
Extrapolating that bit to make some grand assumption about his personality is beyond ridiculous.
It's only 5 seconds edited down to match your attention span. Exceed it, I suppose, because the fact that personas exist is not the pertinent part, it's the glimpse past BillG's persona to see the compulsive competitive behavior: inventing a chair game, "cheating" at it, and instead of brushing it off as silly fun (which everyone would have accepted) getting increasingly flustered until he walked out of an interview.