Because women usually wear bikinis on the beach.
Should she not use an indoor swimming pool because she was made a tweet that was clearly about women wearing revealing clothing in everyday wear or going to the club?
If she was wearing some see through shyt or wearing something that only covered her nipples then I could understand the screams of hypocrisy.
Maybe she shouldn't, the statement I saw didn't have all those qualifiers in it. Seemed pretty cut and dry.