It's a sad reality and the truth does hurt.
If a beach isn't cleaned regularly this is what it will look like, and litterers are only part of the problem. It's also true that some of the plastic is washed up by the tide and does not necessarily all come from the Dominican Republic itself. Other islands, the continental mainland, and shipping are also responsible for part of this waste.
The photographer makes it clear that she is highlighting a global problem, but I still see some Dominicans attributing it to a supposed smear campaign against the country. This is a kneejerk reaction, a reluctance to take responsibility for a problem that needs to be addressed urgently. Not just by cleaning beaches more regularly, but by reducing consumption of plastics and foam, doing more to educate the population and strictly penalising litterers once and for all.
You just have to see the trash along the roadsides and central reservation of the highway to and from Punta Cana airport, and the taxi and tourist transport rest stops. Tourists are repelled by this kind of thing and you hear those comments all the time.
My son said: As much as it bothers me to see a photo like this being published, it's worse that a photo like this can be taken. We have to look after our country and keep it clean if we want to live from tourism.
Also worth pointing out that the photographer also submitted some beautiful images of unspoiled scenery from the Dominican Republic.