Hello and welcome,
Yes, it seems there is more under the surface that you are not aware of. Because of that, it is usually best to drop the subject since, at this point, it does not appear any harm has been done since you did go to your supervisor about the situation.
If you do wish to press the issue further, I would retain a local employment law attorney because you do not know what you might uncover and your job may be at risk. Retaining an attorney to guide you often motivates individuals to act more reasonably, meaning that your job would likely be more protected.
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