This one's for the community.
When your PC is hanging out in a public social hub (like a town square, a tavern, a busy thoroughfare) your RP might be somebody's first impression of your character, or might be one of the very few impressions they'll ever get of your PC. So, take a little time to think about your RP in these spaces and consider if it's conducive to the way you want people to treat your RP and regard your character.
There's no nice way to put this, so I'll be blunt. The level of modern language, meme references, and goofiness in general, has gone from occasional subversion of convention to constant and frequent practice.
It's difficult to report this kind of behavior, or even point out any specific persons guilty of it, because it is so prevalent, so normalized, it's just everywhere. And, its also some times a matter of delivery, tone, and character portrayal. However, it will benefit to give some examples.
"Yikes," "Wife Material," "lives in head rent-free," "I am [god's] strongest [meme]," "Dripped out," "I'm just silly lil guy," and so on.
I'm sure you're seeing what I'm putting down here.
There's nothing wrong with using some modern language like "Hey" or when it's slang that portrays the character as uncultured/young/streetwise/etc, like "what's good." I'm even cool with goof troop hours when it's just the gang hanging out in their private/not as often traveled spaces.
For me, the problem is that I've found my first encounter with a lot of characters these days is during the goofin' hours in public hubs (like town squares, taverns) or public events. Sometimes it can be quite a whiplash to read a character description that reflects a really carefully considered character and history, and then you find them using some really strange behavior that doesn't seem to correlate to the character.
So, again. I'm not here to call anyone out or tell anyone how to RP or deliver some essay on how to write good. I'm just here to give some feedback on the vibe and remind folks that sometimes your goof troop hours might be somebody's first encounter with your PC. Maybe think a little more on if the impression you're giving off is necessarily the one you want for your character.
do with that what you will.