If teachers are experiencing classism in there personal lives or in the workplace it could interfere with forming positive relationships with all the parents and families they work with. They may be less likely to invite some of the families into the classroom or less likely to speak freely and start conversations with some of the parents. On the other hand, in the classroom the teacher may be more conscious of ensuring that all the children are treated fairly and respectfully. The teacher may be able to help children learn how to stand up for themselves and appreciate differences in others better than if they never experienced an bias behaviors. When experiencing a personal "ism" teachers are more aware of the pre-biases that may be forming and might be more motivated to try to stop them from forming in the children they work with.
Reference:
Derman-Sparks, L., & Olsen Edwards, J.
(2010). Anti-bias
education for young children and
ourselves. Washington, DC: NAEYC.