Everyone deserves basic civility until they make themselves highly unworthy of it. But respect is something different altogether.
re·spect
   [ri-spekt] Show IPA
noun
1.
a particular, detail, or point (usually preceded by in ): to differ in some respect.
2.
relation or reference: inquiries with respect to a route.
3.
esteem for or a sense of the worth or excellence of a person, a personal quality or ability, or something considered as a manifestation of a personal quality or ability: I have great respect for her judgment.
4.
deference to a right, privilege, privileged position, or someone or something considered to have certain rights or privileges; proper acceptance or courtesy; acknowledgment: respect for a suspect's right to counsel; to show respect for the flag; respect for the elderly.
5.
the condition of being esteemed or honored: to be held in respect.
I'm assuming this post is about points 3, 4 and 5. None of these are warranted to someone whose qualities are unknown. Therefore it must be earned.
Showing politeness or civility on the other hand is a completely different issue. I feel everyone whose qualities are unknown should be treated with civility until they prove themselves unworthy.
that's how I feel anyway