[Image description: text which says "You're a 10 but it's on the pH scale". Underneath is a picture of a woman whose face suggests she is dropping hard truths. OP has since learned that this is a character from a show saying "You're basic" and that the post is accidentally self-referential]
This character is saying one of her catchphrases here: "Ya basic". The Good Place, S1E13
I try to make my alt text include the source media if i can, but i don't think it necessarily ruins the joke of the post just bc the alt text doesn't say, "This is the character Eleanor Shellstrop from the show The Good Place"
The joke here is that a pH of 10 is considered basic (as in the opposite of acidic), and the character at the bottom is calling someone basic (as in the devastating human insult). The current alt text does not allude to that connection in any way.
Fixed