Tell you what cracks me up - pilot's with jets in their eyes who think every new start up is going to be a wonderful, money spinning success, and can't handle any comments that aren't blowing smoke. It's got nothing to do with giving them a fair go, tall poppy syndrome or bitterness - it's about seeing through the spin and keeping it real.
Generally wary comments will be posted by those who have been personally affected by the collapse of yet another failed aviation venture, or have watched one unravel nearby. Every startup says they are bringing something new/ different, have the most experienced team, are more efficient. Problem is if the idea isn't good it doesn't make any difference.
Try looking past one jet with a new coat of paint and look at what exactly they are doing and why it hasn't been done successfully before, otherwise you might be looking for the unemployment office.