HR informed I was rejected after an interview without telling me the reason(s). Should I be bothered why I was rejected?

Likely they won't be inclined to share unless you have a close acquaintance there

Next time, don't ask for rejection reason. This information is P&C.

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Just think of it as you are not a good fit for the company. It is not just about your qualifications; your attitude makes a lot as well. Plus your expected salary and etc. In short, you just have to move on without looking back too much.

HR probably won't be bothered to tell you even if you ask.

It is normal that HR wont tell you the reason.