It's unfortunate, but I don't see how this wouldn't be expected. You know you work in a business that has a negative image. You also (presumably) know your parents and their religiousness. It's not a big jump to assume that they would disappove of your job.
And as for it being a flaw in someone's character for not liking what you do, that's just wrong. The porn industry isn't all bad, but you can't seriously deny that it does use and exploit people. Generally, if you end up in porn, something went wrong in your life. And sure, there are other industries that do this, but few that do it to the extent that the porn industry does.
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