Even if you are not a morally upstanding people, STDs still affect you (even more so), so not caring about it doesn't even make sense from the heckin scientifirino doctrine of r/wholesome chungus 100 because its not rational either.
I've only ever used discord for gaming servers or to talk with IRL friends or pre-existing internet friends, it would make sense namefags would try to replace socialization with a giant discord server where everypony is added for slop points because why not.