The feebs no doubt have Stingray units (or something much more advanced by now) set up and monitoring in non-permissive environments. If you walk near a non-permissive environment, all of your metadata is going to get hoovered up. You are not only putting yourself in the spotlight, but your contacts as well.
I'm pretty sure even Antifa has figured out to leave their cell phones home or at least in faraday pouches.
There was a graphic that came out last summer where some 4chan collaborators were able to ID and doxx every Antifa member around Portland or Seattle just by using a little metadata dark magic obtained from one member.