Guys, Why do 30 year old guys hate so much on men in their 40 ?

I'm engaged with a sweet kind christian guy. Surprisingly we connected very well not once we never aurgue fight. He very sweet something I never saw ina guy my own age. Now I noticed that guys my own age make hateful comments andntry to compete and get angry when they see a girl my age with a mature guy in his 40s. From what I've seen guys in their 40s attend to be more mindful and mature while guys my own age are all men childs giant 5 year olds traped inside a grown mens body. My ex was very violent and selfish. Are just men in their 30s all men childs?

Guys, Why do 30 year old guys hate so much on men in their 40 ?
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