You were the backup friend for them,they didn't invite you to anything until Shinso shouted back at Denki for flanting their hang out to you while the clasd watches in shock,Bakugo a bit proud but a annoyed with Shinso.Tokogami feels bad for you

Shinso: You guys are always going out!! Leaving them behind! Why?! What did they do?

Denki: "They never come out,it's fine!" he says confidently

Kirishima: "See,it's fine!"

Mina: "Yea, I see no problem."

Momo: "Me either" she shrugs