Tough choice... simply put, you need ICU experience. I would not concern yourself with one person's negative work attitude, however, I would suggest you look into the larger facility's ICU's (for future reference). You want to know what people think of their work there since your career objective is to work in the ICU so that you can become a CRNA.
I decided to work for a larger hospital that pays less than other outlying hospitals because the larger hospital has 5 adult ICU's and therefore multiple opportunities... more than the single 10 bed unit in one of the smaller hospitals. I was told when I was still a student that none of the ICU's hired new grads, but later found out they make exceptions. I was hired directly into a MSICU out of nursing school
. Perhaps you can too. If you know you want to be a CRNA, work hard to get into an ICU ASAP. (You'll enjoy the work more too!)
Your ICU experience, whether large facility or small, needs to be backed by solid academic and career preparation. Have a solid GPA, take advanced classes, get your CCRN cert, score well on the GRE.
Hope this helps.