Things on the internet that make me cross

Put me right if I am missing something please. I thought that the purpose of the 2018 General Data Protection Regulation (GDPR) was to require all websites to seek your agreement to data held about you and what they do with it (with particular reference to sharing with other organisations and websites). So far so good; laudable intentions. However, it seems that this is now being widely interpreted as REQUIRING visitors to a site to ACCEPT their data policies - especially the holding and sharing of your personal data - as a condition of being able to access their site. Some sites play the game and have links to the lists of their data and sharing relationships and sometimes you can untick the boxes of those external organisations you do not want your information to be shared with. Too many sites, though, offer no option to approve data usage but deny site entry unless you agree. This seems completely wrong to me and a retrograde step in the usefulness and ethics of the internet, but I am prepared to accept that I have misinterpreted both the intention and the mechanics of these pop up notices.