Protesting is simply demonstrating you disagree. Just because you don't agree with them doesn't change that.
Disagreeing on what though, democracy?
It's an illegitimate protest based on hating the outcome of an election. It's even more ridiculous when the ones that got arrested didn't even bother to vote.
If it displayed anything positive at all, it would be the fact that these people can go out onto the streets and vent their nonsense to assassinate Trump, rape Melania or other grotesque things without being put down by the police is a real testament to the freedoms they ignorantly enjoy, and the thankless few who uphold it.
And I am pointing out that the protest on that stage has had a vastly bigger impact than their vote ever would have.
Though he was quite well spoken and respectful to the vice president elect, and it may have been perceived by some as an assurance that the future US government are aware of their concerns - it was probably vastly seen by the majority of Americans as just another cringey misinformed liberal clueless about what the Trump/Pence administration want to achieve.
That said, the vice president was respectful and even said that he wasn't offended, and said "that is what freedom sounds like."