Sincerely, you're asking for ideas, and there are other opportunities to vote besides the past presidential elections. If you don't find that suggestion helpful or think it was offered in bad faith, just ignore it. Getting heated or snippy isn't going to do much to encourage others to submit ideas.
Edit to add: And being able to not react reflexively to every perceived slight is itself a good suggestion as it's going to make you more effective in dealing with a lot of the polarization that's out there.
While the previous poster is being a little flippant I don't think he's being totally unhelpful. If you want to send the message you are unhappy with Trump then on top of any protesting you do also make sure you get people to vote, when they can, against his policies. There are mid terms in less than two years so make sure the Republicans who support him take a hammering at the polls.
Edit to add: And being able to not react reflexively to every perceived slight is itself a good suggestion as it's going to make you more effective in dealing with a lot of the polarization that's out there.