It might just be that they don't even think about you as someone who is interesting in interacting. That they basically dont register that you exists. It is not necessary that they hate you.
if you joined their whatsapp group out of self-invite and they begrudgingly obliged, then you will see all their invites and still be self-inviting yourself to their other events unless they personally asked you
but then those other people are begrudgingly inviting you out of politeness since you asked, rather than being a genuine invite