No one wants to say bad things about others
When a person is matching a friend or loved one with someone for a date, saying they have a good personality almost guarantees failure. The single person feels their hair curling or going white with stories they have heard about dates with good personalities, and they know their own nightmares are about to begin. They imagine a person who will stop at nothing to trap them, and they wonder how anyone could believe they should be tortured this way.
Personality remarks, even a great personality, are considered a death knell for daters. No one wants to say bad things about others, and this is one way to cover up flaws in a blind date. There are people who have a great personality, and they are fun, intelligent people. These people are often the life of the party, and one must wonder why they need a friend or relative to set them up for a date.