Okay, well, Protesting, by itself, is not a democratic value.
the democratic action, is to make yourself heard by voting.
protesting is just the ability to express your opinions.
and, in this particular case, those opinions are against what what happened in a democratic procedure.
hence, it's anti-democratic.
and like you said, most protest also want to make a change
but let's say there's a vegan protest, they want to change laws regarding animals.
i wouldn't say that's an anti-democratic protest.