You are correct. Based on the experience you had with two Delta Chis, I think it is safe to assume that ALL Delta Chis are, in fact, mean and heartless.
Delta Chi's here at UNLV's campus are awesome! We did homecoming with them and when they came to serenades they gave every new member a gift bag and some flowers etc. Sorry that your experience w/ D Chi's isn't so great~ But I agree with LeslieAGD about what she said~