it's never "time" to stop being respectful to any other human being.  If you don't like them or what they do, then respectfully disengage with them and go do your own thing.  In the hobby, respect is paramount and sometimes involves shades of meaning.  For example, some providers do not like to be intimate with men who have certain disabilities.  The men shouldn't read this as disrespect but should recognize that this profession involves intimate physical contact and that if a provider can't be comfortable and can't do her job with someone who's disabled, that peference should be respected.  

But it is never acceptable to just "disrespect" someone.  Generally, in the hobby, respect means being on time, clean, courteous and treating the other person like a worthwhile human being.

Rates ranging anywhere from $250-$1000 per hour don't add up to "very little" in my world. You ladies ask plenty, and I am generally glad to pay it.

That said,
The answer to your question is, of course, never...

There is no excuse for the hobbyist to disrespect a legitimate provider. Of course...there are bad apples on both sides of the coin. We can't let them bring down the whole bunch.

just my 2 cents...

-sobaka

No one can take your self-respect unless you choose to give it away- Mahatma Gandhi

Only when they've done some shitty thing to deserve a loss of respectful treatment.

robbed you;
endless lytried to upsell;
gave you an STD;
physically injured you;
blew you anonymity;
and similar outrages.

These women are fellow human beings.  because they do a job not socially acceptable on a uiversal level, is no reason to trat them badly.  Unless you have cause.

they act like a prima donas - and of course after that is determined, I would not schedule with them anyway.  Could not entertain thought of a session with her.  So, she would not be aware I do not respect her.

granted there may be limits that stretch all of us, but even then civility should be the fallback, not disrespect.  Wouldn't you want the same?

Never.  PERIOD.  The Golden Rule should prevail--treat others as you would want to be treated.