Once you start offering ultimatums in any relationship, the relationship is over. Definitely don't do this. Not on LinkedIn. Not on any social media! You want people to stop talking to you, just block them! Unfollow them! Easy! Why be so brittle and controlling? JUST MOVE ON!!!!
Also, what is the logic in inviting someone for coffee, but if they reply, you're gonna block them! Just madness!!! Some people have productive coffee meetings somehow, but not me. I'll drink coffee at home from now on thanks.
Fun fact:: I will not talk to you about dildos on LinkedIn. I will, however- discuss it over coffee. Although that would be an unconventional conversation for me in such a scenario, it would be preferred by me to leave such subject matter out of view of future employers and stakeholders.
That makes two of us. Thanks.