Double pricing is very discrimimating. At japan thai youth centre ( which was funded by Japan government several years ago), a non Thai ( even Japanese person ) has to pay 150B,
a Thai pays 30 to use swimming pool. Similarly, a foreigner has to pay 5 times higher than a Thai counterpart to use badminton or running fields. It is okay if a foreigner has to pay more. For example, 50, not 150
What if a foreigner has to pay 5 times higher for every thing : electricity, water, beer, etc. For example, a foreigner has to pay 20 per kilowatt hour, a Thai just pays around 4 for electricity bills, meaning a foreigner pays 5 times higher than a Thai.
https://www.mea.or.th/en/profile/109/111
https://www.google.com/search?gs_ssp=eJzj4tVP1zc0TDIvqTA0y8oxYLRSNagwNkg1skwzskgyTEk1NjQ3tjKoSE0zTTUxMkg2TjFOS04xTvISzSnNLcjMy1QoLs_Mzc3MS1coyM_PAQBcMRf0&q=lumphini+park+outdoor+swimming+pool+pathum+wan+reviews&oq=lumpini+swi&aqs=chrome.1.69i57j46i175i199i512j0i390i650l2.9652j0j7&client=ms-android-samsung-ss&sourceid=chrome-mobile&ie=UTF-8&si=AMnBZoFzHNFdRXXan2JJdBw_EB_2R6vnecv6U31jw3SXlngwKnSQbjaybdyyOlSdH6XevBL9KCCGJJjPXjWQO-ijiEtLMmNw_1eu__Zz_-_d1kKTD8eMrLUwA5oTP6WfXOwwkwq3UA2sPi3DSwhVXvsunvf5dEe_gWf3EIkM5SLVGcfW7fcv74M%3D&ictx=1&ved=2ahUKEwjJp4WmvNH-AhVI2TgGHdb4AsMQyNoBKAJ6BAgPEAk
Read those reviews.