I start from a position of respecting everyone I meet. I can then lose respect for people due to their actions or opinions.
I sometimes come in contact with people who believe respect needs to be earned first (and see this mentioned occasionally on MN).
The people who take the latter view generally do not act as if they need to earn the respect of others and demand you earn their respect before they treat you in a courteous manner.
So, AIBU to think that it is preferable to respect everyone until they lose it in some way, rather than start from a position of 'no respect until they earn it'?