Good rule from when I did CW stuff as well is “never share anything you write under the influence of anything unless you want everyone to call you on it” and this was put to the test like the second day of the class it was talked about in, as everyone picked out which person wrote their poem stoned out of their mind and everyone got it right, haha.
Workshopping is good, though you have to be ready for people to be brutally honest, and recognize that you are probably going to have your feelings hurt, though no one will be actively trying to hurt your feelings. Nothing is your baby is really legit advice, but you still will get hurt at some point ant that is OK.
It tends to work best in person, but online is not impossible. The only reason I mention in person is that it’s easier for a person who is giving criticism to note if feelings are being hurt and back down a bit, or to see if someone is eager to have a thing torn apart and actually really get into dissecting it. I have seen both happen.