I have flown Malaysia Airlines for half year when I was having working holiday in Australia, they are very professional and cabin crew are very nice, even for a 12-hour flight from KUL to LHR, still very stable and nothing happened
It's almost impossible for a plane to drop 1000m. Even in strong turbulence. Particularly on that flight path. Paul exaggerates a heck loads in all his show appearances. It probably *felt* like that but that doesn't mean it did. People shouldn't be scared of flying.
Anything that bad is a rare occurrence and would make the news. For a short haul flight a 1000m drop would have definitely registered. See www.google.co.uk/amp/www.dailymail.co.uk/wires/pa/article-3767060/amp/Passengers-hurt-severe-turbulence-forces-US-London-flight-land-Shannon.html?client=safari (not even in meters)