Agree. The most insufferably boring and self-important people I've ever met have been professed Mensa members.
When there is a significant difference in IQ, and I believe the number is around 30 points... communication can become difficult and this may be seen as boring insufferable in individuals who may not have any elitist tendencies.
Some individuals can learn or are capable to moving a little more seamlessly between different groups despite having this handicap.