How to block group invites?

Hello, my friends/family keep inviting me into tiktok chat groups but i don’t want to be part of them, but everytime i leave they readd me even tho i keep telling them to stop they won’t, kinda annoying. Is there a way to block those group invite, still don’t understand why there is no option to select if you or not to join, they just put you into it without any choi