Locking as this question volates rule 5.
Don’t let that bug you. They are no longer taking up your time and energy, and that’s what matters. If they are an asshole, chances are high that others are blocking them anyway.
Is really stupid.
Blocking here is simply a way to remove annoyances from your sight, nothing else.
If you need to prevent them from repeatedly contacting you, or spreading bullshit against you, or something similar, contact instance admins instead. They’re the ones responsible for keeping users safe.
Blocking you stops you from hearing from them, not them from being able to see you.
Otherwise it’d be used as a debate winner by stopping people from being able to respond for others to see.
Basically it’s predicated on the idea that if you can’t see it happening, then it doesn’t count as continued harassment and bullying.
