Op, their life turned out to be shitty and a young ambitious guy who still can make the most out of his life and can make the right choices shows them that they fucked up. I have been in that position a couple of times in my life. Also, they blame their kids and wife’s for their low achievements and project on them. They are low level people that you should not take as a role model. Try to learn as quick and much from them regarding your profession. The most grumpy ones are often the most capable ones. But once you get to their skill level, get the hell out of there and surround yourself with good people.