Try to find a new one, or a static. There are a lot of players who want to run class runs.
How do you know if they notice you? You can't mind read, can you? If i run into multiple class-runners in duties on a late night i sigh, start up youtube on my phone, maybe try to vote kick them or report them after and if i'm the tank i might single pull or be too afraid to w2w at least. So i wouldn't write anything in chat. There are to many class-runners. It is 99,9% deliberate. So what good does it do to call them out? Most pretend to not know what a job stone is. That's it.
I know we spam this thread with our discussion, but there is still this 1 angle you didn't answer to yet. Do you know the others are actual players? Real humans with lifes? Most of your defense for saying it's ok to class-run boil down to YOUR enjoyment of the content while my critiques always came from the negative impact your behaviour has on OTHER players. The recommodations and the claim that most don't notice address this but even if a bunch of players are ok with it, if you que you assume everyone is. You expect them to be.