Recently Jackie Chan and Liu Yifei are a couple of higher profile individuals have expressed support for the mainland or condemnation of the protesters' riotous behavior. Jackie Chan is a Hong Kong national - Lieu Yifei is Chinese American. The reason that this is relevant is because we live in the day and age where holding the wrong opinion is increasingly frequently grounds for getting black listed or worse. They feel strongly enough that they're willing to risk an immense amount, just to share their views and values.
They they feel so strongly about this issue is reasonable evidence that many others also likely feel strongly about this issue, and not necessarily in support of the protesters. Consequently, there are undoubtedly large numbers of people expressing genuine negative views against the protesters. How many of these individuals ended up getting banned? It's twitter. A huge chunk of the userbase posts like bots. There's not exactly a whole lot of insightful discussion going on with 140 characters + memes. When you get into political talking points where real people are simply repeating the same talking points at one another, this gets even more extreme.