Anybody that blindly supports a candidate is the type of people I’m referring to. 99% of people think they know more than they actually do, but most people know to not talk about things unless they feel confident in their knowledge. Kid’s bar for that is much much lower than older people.
Also it's not something we have against kids or younger people, it's just that as you grow older you hopefully learn a lot more and take classes like US government, APUSH, (political) philosophy, etc. so you can critically think and understand who and what you're voting for. There's far too much partisan politics or blindly following a party and it's easy to fall into that especially if you're younger is the point.