How can I stop someone from liking my profile?

The best option in this instance would be to block the other member. Blocking a member means that you automatically reject any further communications from that member. It also means that your shared information with the blocked member will be deleted, including messages, and favourite lists (if they are on it). The member's profile will also not appear in searches you perform.

To block a member, please visit the member's profile and select the icon in their profile summary bar and select 'Block'.