I've been to several Tea Party events and have never one time heard anyone say anything remotely racist. In fact, the biggest applause at the events was for minorities who stood up to voice their opposition to big government. The crowds at the events I have attended were predominately white, but there were also Hispanic, African American, Native American and Asian people at all the events.
The events I attended were in Texas just for the record. We Texans are pretty independent-minded.
There was also a very wide array of ages present - from kids to college students, to young families, retirees and the elderly.
Like any movement, there are going to be fringe elements that are counter productive (ACORN, anyone?) and give the majority some bad press.