Riding the “wrong” way in the bike lane？

I’m curious to see how other cyclist feel about this. I live in the U.S so in most cases the bike lane is on the right hand side of the road. Generally speaking as well there is normally a bike lane on either side of the road. Is it normal for riders to go the opposite way of traffic in the bike lane? I feel that this is super unsafe especially when there’s a rider coming the opposing direction. So I guess I’m asking aren’t bike lanes directional or am I off base here?