Pretty much anytime there's an anonymous action commited against you;
ie;
Somebody robs you --> They come in in the thick of the night, break in, you've never met them, heck, you never see their face, but they've taken something precious, and you want retribution.
Somebody kills somebody close to you --> You don't know them, at all, what you do know is they took the life of somebody you love, and in essence, they'd be somebody you'd want revenge against.
Even going Quasi-Philosophical here, for the schizophrenic, Bipolar, etc, the parts of themselves that aren't themselves but torment them can be considered almost as a manifestation of an enemy they don't know.
It doesn't really give Venom an excuse to have a poor motivation, Raimi did it better, even though I believe its possible to hate someone you don't know, I can't see how it makes much sense in a narrative.
Considering the flaws with the character, the clear studio push for Venom and Raimi's personal dislike for the character, he definetely did a superb job in actually capturing a realistic depiction of Venom's charcter, props to him for that.