it might sound dumb to you, but not capitalizing sentences properly amongst certain groups effectively means you’re not concerned with the optics of being viewed as someone who “doesn’t know grammar”.
it sort’ve displays a certain “I know proper grammar but I don’t really care to prove it to you”.
edit: and as others mention, it can be seen as less formal and friendly as well
it might sound dumb to you, but not capitalizing sentences properly amongst certain groups effectively means you’re not concerned with the optics of being viewed as someone who “doesn’t know grammar”.
it sort’ve displays a certain “I know proper grammar but I don’t really care to prove it to you”.
edit: and as others mention, it can be seen as less formal and friendly as well
don’t shoot the messenger :)