Better yet, if someone offers you their IQ score, smile politely and say, “Wow! That’s quite good.” Then remind yourself that high IQ scores don’t necessarily translate into anything useful. I read about a guy a while back who has an IQ that is supposedly the same or better than Marilyn Vos Savant, yet instead of chosing a career in the fast paced field of rocket science, he is happy just being a janitor (nothing wrong with that). Likewise, some of the greatest and most influential minds in human history have had only mediocre (estimated) IQs.
For the most part, IQs are just another way for people with low self esteem to feel better about themselves. It’s also gives people something to lie about in case they don’t like to fish.