We absolutey had incels. They were just as angry, but they included society in general for their problems and trash talked women, they just didn’t have the focused echo chambers we have today that let them run the mental gymnastics that placed so much blame on women. They didn’t have the incel label to wrap around themselves. They more or less became shut-ins living at home getting drunk and/or stoned, so yeah, they absolutely were shunned.
If you take a few minutes and actually think about your high school and the few years following I bet you’ll remember a few people that fit the bill.
For some reason killing a bunch of people because incel rage hadn’t entered the zeitgeist; even though workplace shootings did happen they weren’t remotely on the scale of mass shootings we have today.