Keep in mind Linus is just a guy who accidentally rose to fame after his little weekend hobby OS thing took off, not because it was technically well developed or because he was particularly amazing/competent developer, but because he happened to stumble on a value added that was "free Unix".

After a ton of other people built things up for him Linus obviously thinks of himself highly technically talented but the fact is, that there are thousands of people who are just as capable AND can conduct themselves without such arrogance and hostile and (often) uncivilized attitude towards other people. In summary just a random guy who thinks way to much of himself and let it get to his ego.