I remember we received an application from a person whose resume promiscuously explained that he was a Mensa members, "an association for superior IQ people".
Their resume overall was not bad (not top-notch either for the position), but the mention alone of Mensa drove me away from ever wanting to work with such kind of persons that look so full of themselves.
I finally declined to interview this person. The question "Is it discrimination?" was always popping into my mind and I felt uneasy about it for about a week or so.