That is my experience I can't speak for yours.
But it's also the impression I get from the DnD Reddit and other forums too.
Obviously you can find other people but I am generalizing that's all I can do.
I don't think it's necessarily the DM's ( altho yes a lot of them are like that ).
I think it's moreso the players tho.
Most people in my experience are just kinda boring and react negatively to people who make different characters who stand out.
There's an online DnD group that performs on stage sometimes called '' acquisitions incorporated '', I think those are fun to watch but again IN MY EXPERIENCE people take it way too seriously and don't really allow for fun like that.
But yeah I think most DM's are probably more open-minded about it but there's quite a lot of players who just go in with the mentality of it basically being a MMO dungeon group.
And I think that the general DnD community is extremely uptight and gatekeep a lot even if they like to complain about gatekeepers.
To some extent this will be true with most communities because I think a certain type of person has a tendency to be the most active on places like Reddit in particular, but ultimately that will affect how the community is viewed too.
I actually used to play DnD with a couple of friends as a kid too and had fun I kinda miss that.
As an adult tho I've had quite negative experiences and people who take things VERY seriously to the point it's not fun.
Edit: I'd actually say that this applies a lot to tabletop communities in general, I dunno if there's just a lot of jaded people who grew up with it and became really uptight as adults or something.
But I've noticed this in other tabletop games too.
I love Warhammer too I think it's a bit mixed there too altho not quite as bad in my experience.
There's just a lot of people who have very set in stone ways of thinking about how things '' should '' be played and I think in a game as old as DnD that sits pretty deeply.
I think younger players might be a bit different this is mostly my experience with more middle aged people at least.
But yeah it kinda feels like playing with your not so tolerant to different things parents or something.