I played Roblox before Blockland too but considering the maturity of their user base I have seen stupidity far and wide in that game. Not all of them are stupid but there's no denying a stuff ton of them are.
The community is split into three groups.
Group 1: 70% of the community.
A huge pile of stuffheads who drool over games like "buildl an obby to defeat spongebob!!!!!" and never really talk unless if it involves free money.
Group 2: About 20% of the community.
People who go on the ROBLOX forums, can vary from stupid or sensible depending on which section they usually go to, they love memes that died in 2008.
Group 3: 10% of the community.
People who don't really go on multiplayer often, but make games and script, and join forums such as Ironnoob instead of the built-in forum on ROBLOX.
I hang out with Group 3.