I have been playing SS13 since around 2016. That makes it sound like I play SS13 actively. In reality it's something I go through fixation phases like once every year or two years. I think one of the funniest aspects of the game is how the top 10 server list consists of 18+ furry servers, fascists, 18+ fascist furry servers, and Goonstation - the lightning rod for new players who aren't furries, horny, or fascists.
Goonstation's community has been lovely for as long as I've remembered; even in 2016 they were ahead of the game in terms of being a friendly, welcoming, and inclusive community. Even a lot of the nowadays progressive servers used to be far edgier in 2016, but Goonstation has been decent for the longest time, despite(?) their SomethingAwful-based origins.
I was a member of an 18+ furry server's community for a little bit - one of the smaller ones though, because all of the Well-Populated servers in that vein are nigh universally cesspools for one reason or another. It was a HRP server, and one time I had a very fun 8-hour long shift (where I played for the full 8 hours), but it gave me such bad "heart attack anxiety" I nearly threw up after I finished the round.
I find the real differentiation between HRP and MRP is the quality of gameplay. HRP expects you to be in-character at all times (it does not have to be in-depth though), which means there isn't as much room for "trying to break the game" type shenanigans - leaning into The Chaos has more of a limit there. In MRP, they expect light RP but it can be very basic, and they let you get up to more Shenanigans, but you should at least pretend you're a Member of the Crew.