Hi BEK,
I don't know how to remove the button; but I caution against doing that as you may alienate legitimate visitors to your site who may genuinely need help.
You'll always have that 1 visitor who is up to no good and has malicious intentions. Heck, I think we all have visitors like that. However, 1 bad person, shouldn't spoil it for everyone.
Just my two cents

Best!
- Jay