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Basically, due to her typing as a Fera-Beastial some people aren't too fond of watching them as main actors in films and plays since they are essentially sentient animals. Not many take them seriously and are more attracted to regular Beastials who have more humanoid features that is common throughout their society. Even Havens (humans) get more notoriety than Fera-Beastials so it's sometimes seen as racist.
As for the proposal for working in a porn studio, since she's a snake you can imagine some people would want to use her as a cock sleeve or at the very least be capable of jerking people off with her body and have her suck them off. Just more insults due to her body-type and Jo-Ann would prefer to not do it if given the choice.
Basically, due to her typing as a Fera-Beastial some people aren't too fond of watching them as main