Only when their anger aligns with major political policies of the current regime. No one is looking at someone belligerently pissed off at trans exclusion or lack of action on climate change and saying "Heh, Trump voters, ammirite!?" Yes, someone who is pissed off at gun control laws is not necessarily a Trump supporter, but if that is their main platform of concern that gets them riled up, barring any other context, it's not unusual to put them in that camp. Nor is it ultimately all that harmful, as far as I can see, to do that even if turns out to be innacurate.