Of course they know.
People really need to read the article because Mark Ruffalo’s response was amazing.
He did not ridicule the fans for their slash art. He didn’t say they were gross. He instead GOT EXCITED and praised them for being so creative and taking the characters to heart and running with them.
Also, ugh those fucking two they are so cute
THIS IS THE BEST THING ON THE INTERNET
LOOK AT THEIR FAAAAACCEEEESSSSS