Look, if someone tells you he is high, he either wants to tell you that you should not expect too much of him right now because he is in "chill mode" or he is trying to find people who share the same mood as him. Same for beeing drunk. Its fun to play with other drunk people because the sense of humor is shared more.

Think about it this way: If you want to tryhard ranked playmode, you will probably tell other people that you wanna go full tryhard because you want to group up with people sharing the same mood with you.

I think its just a natural way to communicate with each other.

Does that make sense? For me it does :)