Yes, a girl known to be working the street will be shunned as hitting bottom, prolly drugs. This is not at all necessarily true. Some just looking to make fast money.
Usually, it's that the street walker is thought of as a little crazy as well. Some honestly do lose it. The work and it's distractions drive them over. Really nasty home life, raw deal. Debt, family debt.
As for a true random freelancers not being hirable - Never heard of such a thing in 35 years. The notion that a Pattaya bargirl (especially an attractive one) would effectively be black listed from the gogo, bars, etc. This is tourist / hapless dreamer magical thinking. It's patently absurd. You pay your money and you take your chances.
Some girls will let you hit it sans condom. If she's hot she'll ask for more bc she can. If she's not you really shouldn't be risking unprotected sex with an unattractive person, but hey now. She's happy to oblige. Many have come to accept their transactional existences. Rather nonchalant about STDs. While it's pure panic for you it's part of the hazards of work.