I took a sample test once and passed, the Mensa rep told me I should join etc. I had planned on it but I did some research and also encountered others that were in Mensa and it just turned me off.

Honestly most Mensa members are just very pedantic and condescending people who wield their IQ as some badge that they are somehow better than everyone else. It's basically a glorified social club where they circle jerk and pat themselves on the back about how smart they are. That's my opinion on it anyway.