Will colleges look down upon my MENSA membership because I have a 3.7 GPA? I did some stuff outside of school like participate in internships with NASA and I even built my own supercomputer which was later featured in a $250,000 scholarship award for science talent
Mensa membership won’t be much of a consideration on your application, if at all.
Sounds like you have some nice ECs to put on your application!
MENSA isn’t worth mentioning at all unless you were an active participant in local activities, in which case it would be just like reporting any other random club you were an active participant in.