Maybe some people do not like plastic but, due to some of its exclusive physical characteristics like resistance, weldability, resilience, lightness and watertightness, it is irreplaceable in many contexts. Moreover, sometimes replacing plastics with other materials may actually be harmful to the environment.
For example, the BBC has recently demonstrated that cotton and paper bags could actually be worse for the environment than recycled-plastic bags. The energy required to produce a paper bag is more than the energy required for a plastic bag. As for cotton, it is even worse, as it requires much water and intensive farming, which means that the cultivation of cotton has a high environmental impact.
And also considering the reusability of the three solutions, to be equally environmental friendly, for each recycled-plastic bag, a paper bag should be used at least three times while a cotton bag should be used at least 131 times