First - congratulations. Second, some people are always looking to trash other colleges in some attempt to “prove” that their college is superior for some reason.
The Hippies are all in their 60s and 70s (or older), and their grandkids are the ones who are attending college. Weed is either legal or decriminalized in every state where there is an Ivy league school, and is no longer part of any type of “counter-culture”. Rhode Island high schoolers smoke more weed than Brown students.
You will get a top-notch education at Brown, and will be surrounded by hard working intellectual students, not by pot-smoking hippies.
PS. As a rule, though, it is better to have a weed-smoking student body than an alcoholic student body.