I think every generalization is a fallacy.
But people, of either gender, can dislike each other for any number of reasons, including (but not limited to) jealousy, envy, self-pity, threat, deceit, inability to impress or control, judgment or misjudgment, meanness, negativity, reminders of ex's, perceived slighting , cognitive distortions and mind-reading, miscommunication, etc. More competition than wanting the best for you.
I find men usually are more to the point, more energy, more considerate of hurting feelings long term, more up front honest- whether you like what they say or not/ less two-faced, less resentful, more accustomed to working as a required priority, less likely to talk about feelings .
Empirical studies have shown even young girls are far more passive-aggressive in their behaviours to peers than boys; other studies show girls as young as 7 emoting without internal arousal (distress), and boys the same age hiding it but conversely terribly bothered.