That’s an odd claim. It was a Hugo nominee and won the Locus award the year it came out. But it also shows up on lists of the best books of the 1990s, not just ‘sci fi’ lists.
You don’t have to have liked it, but trying to argue that the ‘rambling asides’ which are the signature of what many people love about Stephenson’s work somehow make it objectively worse sci fi than Snow Crash is a bizarre way to approach literature.
Personally, it's my favorite book of all time. I'm not a Sci Fi snob and rarely read the genre, so I'm not sure what the signaling is.
We're all allowed to like different things, and you shouldn't take that difference as commentary on your intelligence. I think an unemotional reading of this thread lacks condescension or insinuation.
What is your favorite SciFi novel? Maybe highlighting that will help see the difference in style preference. Personally, of the SciFi I've read, after Stephenson I liked Weir and the Altered Carbon series. There's another book that I think of all the time but don't recall the title or author - future dystopia where the USA has split into two countries - conservative middle America red states and liberal coastal states with strongly defended but crossable borders.
If this is what you're interpreting as people talking down to you / claiming that you're too dumb to understand a smart book, you may want to consider that it's a you being overly defensive thing. You're allowed to like what you like. If some people have been dicks to you about your taste, I don't see how that has anything to do with this book. Forget those people.
If by "disappointment" you mean Cryptonomicon stretched the turgidity of Snow Crash to its theoretical page limit, you may have a point.