Wow, so...no.
Zionism is not colonialism, and anti-Zionism is anti-semitic, and I will tell you why.
Zionism, like any kind of political movement, has a spectrum of beliefs. There are deeply conservative Zionists, and there are progressive Zionists. There are Republican Zionists, and there are Democrat Zionists (yes, there really are). You have a extremists, like you do in any movement, and you have people who are invested in intersectionality.
Zionism, at its core, is simply the belief that Jewish people have the right to self-determination in their own homeland.
That's it. That is the essence of Zionism. So if Zionism is being attacked, the above is what you are against, and yes, that is anti-semitic.
Now...if you want to talk about Israel and its relationship with Palestine and Palestinians, that's a completely different issue. I would strongly suggest you turn to the works of Rudy Rochman, Hen Mazzig, and Dani Ishai Behan if you want a greater understanding of Progressive Zionism, instead of treating us like a monolith.
You can be a Zionist and believe that the government is handling relations with the Palestinians terribly.
You can be a Zionist and want the wall to be taken down.
You can be a Zionist and push for Palestinians to have freedom of movement, access to water, education, and the full rights of citizenship.
You can be a Zionist and embrace the co-indigeneity of both Jews and Palestinians.
You can be a Zionist and believe in a two state solution, or a one state solution.
You can be a Zionist and believe both Netanyahu and Hamas are vile and corrupt.
The only hypocrisy that's involved is in a deliberate failure to understand what Zionism actually is, rather than what it is being conflated with.