Drinking alcohol is probably way worse, but you can choose to not drink, you can't choose to live a normal life and not get microplastics.

Also, alcohol has existed since forever and humans have been drinking it since the beginning of civilization. We have a pretty good idea of what it does and how to keep it under control. Microplastics are a recent thing, it may be a dud, but it may be a serious problem for future generations, so keeping an eye on them is a good thing.