...Why?
Because she would 'Excite teenage boys'.

Mothers and fathers complained - even though it's a community pool for which she and her fiance also pay - the upkeep every month... The main complaint was that it looked like a thing - even though it wasn't a thong.
Wearing a normal swimsuit is too provocative now? If she wore a bikini would that have been better?
Would it have been better if she was dressed in this:

How is this - today's standard bikini - less revealing than a one piece that has more of a pull on the sides?
Would they do this to a man dressed normally for swimming?
Never.
Because teenage girls can control themselves? Or because parents of teenage girls actually know what a normal swimsuit looks like?
See...sexism is still alive and well - in this case in Tennessee.
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