Then we agree that a general reference of ones astrological sign is not enough to determine the full extent of a persons qualities.
Yea... It's just a jump starter for a conversation. But if somebody holds your Sun sign against you it does not help socialization skills. They may have difficult communication and value lessons this life. Which is determined by other factors in someone's astrological profile. Difficult Mercury (communication) configurations and value judgements.... 2nd and 8th houses of values.
Very generally speaking though there are Sun signs that are more compatible. For example you and I both have Cancer Suns. That gives us more emotion and sensitvity on the other hand we must be careful that we are not wet blankets and too sensitive. But we do try to understand and appreciate sensitivity to other peoples' feelings. This would be true for Cancer Suns in general but their are always exceptions shown by other factors. For instance difficult moon configurations make it harder to understand the feelings of others.