I don't see why boys can't love horses. Is it generally expected that boys won't like horses? (speaking from the point of view of a boy who likes horses)
I wouldn't read too much into duolingo sentences. Unless you own a single pet ant or your dog attempts to write newspapers
I don't think it's saying that boys can't love horses; It's just saying that girls like them (Although this is a bit generalized). If you like horses, that's fine. I live in a bit of a rural area, so loving horses is sort-of expected by everyone, regardless of gender.
Question! Jenter here is translated into girls. How can I say THE girls? Jentera? Jenteren? Jentaer? O.O Jentarer?