It would also be really annoying if they wore heat resistant gloves to throw back the hot tear gas canisters and if this got shared to all those protesting…
It would be a further shame if people started covering cameras (as seen in Hong Kong, with protestors using poles and rakes to lift cardboard boxes over security cameras), blinding drone optics with laser pointers, and flooding police-run reporting apps with junk data.
It would also be a shame if the protesters noted that plainclothes cops can be identified a number of ways, such as wearing steel-toed boots; an armband or wristband of a particular color; driving white, black, or dark blue cars with concealed lights; or having the outline of cuffs visible in the back pocket or the bumps of an armor vest's shoulder straps under their shirt.
It would be a shame if the protesters began making their signs out of inch-thick plywood to stop rubber bullets,* forming a tight shield wall to prevent police from singling out and mobbing individual protesters. It would be a shame if the people behind the shield wall held up umbrellas so that tear gas canisters fired over the heads of the front line will be bounced away. It would be a shame if protesters began constructing improvised armor vests out of duct tape, hardback books, and ceramic tiles.
It would be a shame if protesters started wearing safety glasses, hard hats, respirators, and gardening gloves, all of which can be found at the same hardware stores as the plywood. It would be a shame if they started using traffic cones (the kind without the hole in the top) upside-down buckets, or other improvised lids to contain tear gas by placing them over the canisters.
It would be a shame if protesters learned that police scanners are legal to own in the US, allowing them to learn where police are moving and what routes they intend to take. It would be a shame if they discovered that these scanners can be used to send as well as receive, allowing them to flood the scanner frequencies with noise.
All this would be a terrible, terrible shame.
*I can't speak for the other things on this list but do not use plywood as a shield! It will not defend against rubber bullets and will splinter if hit.