Twitter is an amazing platform to connect (and argue endlessly) with strangers. While dealing with some of these interactions/fails you may have noticed some users sporting emojis in their handles. This is what they mean.
The use of the emoji in the handle is a way to more easily find like-minded individuals. For example, if you see someone with a rose in their handle, they are denoting themselves as a Democratic Socialist. It's like a badge to let strangers know what they're getting into when starting a discussion/argument.
The symbol was chosen to represent users' pro-immigration stance. The Statue Of Liberty is a beacon for those entering our country seeking a new life. Trump's rhetoric has opposed these views in many ways and people are pushing back. Even his vice president is trying to distance himself from the controversial Commander-In-Chief.
The paper clip was chosen because there wasn't a safety pin emoji. The safety pin is what people in real life wore to show they were an ally and willing to help those under attack of harassment or worse. This trend died off recently, after many felt it was condescending.
This same emoji is also used to denote those who hopped off the "Trump Train." Many voted for Trump hoping he would keep the U.S. out of foreign wars. When he bombed an airfield in Syria, however, many lost faith in the president and his promises.
You'd think the Earth emoji would be used to denote we all share one planet, we're one species and we must learn to get along. If only. This is used to take back and take the power away from a term with anti-Semitic connotations.
The term "globalist" has been thrown around a lot lately. It's the idea that there's one global bank and we're heading towards one fascist world government. The Jewish people are often blamed for this conspiracy, so many use the Earth emoji ironically to push back against these sentiments.
Richard Spencer started using the glass of milk ironically after being told by someone on the far left that milk was oppressive to non-whites.
Don't be mistaken. Not all Trump supporters are white supremacists or even white nationalists. Many identify as Trump supporters with a frog emoji, a nod to Pepe the Frog, a comic character that became an unofficial mascot during the campaign.
Finally, we have the snowflake. You've likely seen this term used as an insult in every single political argument over the last year. Those that use this symbol are liberals trying to take the term back.