It's best to limit the amount of time spent on this forum.
The thing that makes it obvious is when I can see men laughing or taking joy in another man being cheated on or being done wrong by a woman. When people get happy over stuff like that it's probably a sign that they suck with women and it's a coping mechanism to help them feel like they're not missing out on anything. When I see other men trying to convince men that their gf/wife would cheat on them that's a clear sign of a jaded individual.
As for the dudes on youtube, I don't see why you would take them seriously

It's obvious many of them lack experience.
This post definitely isn't made to defend women because I don't think the majority of women are worth my time but no one should be fine with becoming jaded and delusional.