Black family fires racist contractor

For very good reason, a black family fires a contractor who showed up for a job with a confederate flag on his truck in GA.  This raises issues of whether one can simply terminate a contract once entered into (one cannot with out at least having to pay damages, potentially in the form of wasted time and gas money here) or whether this was simply an at-will contract that can be terminated (that does not seem to be the case here.).  At any rate, isn't it incredible that in 2019, some "proud Southerners" still have to display their pride in such a blatantly tone deaf manner?  Racism ought to be a thing of the distant past, but clearly is not.  Shameful!