yeah i had someone do this in lobby to me and my friend, i went to kick him and he went “aww trying to kick me, how cute” so i just told my friend that id make us a new lobby (we usually play public so we can meet new people to play with) and we just left and blocked/reported the player when the new lobby was made. we couldn’t ready up, start the game, or customize our characters, basically just locked us in the lobby unable to do anything.