Rabbits are very opinionated, some more than others, and I suspect your rabbit is just very angry.
I was just very intentionally sprayed (and sprayed again!) by a little just-neutered rabbit, who was making his feelings very clear.
And I remember cutting Dill's toenail to the quick once and that rabbit didn't talk to me (other than the very expressive bunny 'flick off') for three weeks. (And right after the 'event', he flicked me off, jumped up on the couch, looked at me and tore a big hole in it). :shock:
The neuter site can look bad for a day or two, but unless it's hot, oozing, smelling bad or causing him pain (evidenced by the rabbit being a 'bunny loaf', lethargic, anorexic, etc), I wouldn't be TOO concerned, although always better to play it safe if you can.
sas :clover: