I can't handle single-use plastics and the odd time I use them, I try to reuse them.
I stopped using straws way before it was cool and haven't used plastic grocery bags forever, really glad the idea is starting to become mainstream.
I think what put me off the most was starting to scuba dive. Once you see that the crap on the beach is only a small fraction of what is under the water, you will see the truth.
Now you're reminding me of the beaches I saw in Thailand two years ago, with so much plastic on some of them. I tried a little snorkeling there in the beautiful environment, but the plastic is a serious problem there.