The social construct thing is weird even irl. Like if you see a couple with a wide age gap (both of legal ages) many people will always assume the worst despite not knowing the context or history between them whereas these same people never assume when it's same-age couples even though the relationship may be highly toxic/abusive.
It's all about generalizing stuff and unwillingness to think further than that today, because it's easy and they don't actually care about those couples, they're just seeking stimulation in their boring life.