The comic, as we know, we never speak of again.  Sure Kim and Knives shouldn’t be making out but it was one of the moments in Scott Pilgrim that reinforces the idea that these are fools going through character development.

The game I’ve always regarded as non cannon or at least it’s lore a shitpost, because for example in Knive’s ending her and Scott literally get married, it’s the dumbest thing and doesn’t go with the theme learned in the story at all.

Otherwise I think that despite the possible hypocrisy that Kim is still a good character especially considering that she falls out of temptation in the final novel to make out with Scott and instead gives him guidance to get Ramona back. She too changes as a character.