An employer / management create a work environment as well. It may fit with your personality or it may not and you may be partly to blame (expecting opportunity that did not exist, for instance). An employer can be welcoming or expect you to conform. Look at it more as it was not a good fit, vs a bad place to work.
In any case its experience to grow from on both sides. I urge you to think about what made you dissatisfied and let them know. Especially if they are willing to listen.
