Because in America, that statement is so heretical and antithetical to what the average American thinks America is, that most people probably wouldn't even be mad at you for saying it: They'd think you were legitimately unwell/insane.
It's on the same level as saying "I hate liberals and am not conservative".
You don't necessarily have to be antagonistic to small business, you can take a slightly different approach and explain how capitalism doesn't work for small business either. Everytime a Wal-Mart opens up in a new area, a dozen local businesses close their doors within a few months.
The "Free market" has revealed that large scale enterprises with large numbers of people cooperating on a shared goal is the most efficient kind of organization. Small businesses can't compete with that, and we wouldn't want to lose out on the benefits of large scale enterprise anyway. We simply want our labor to be organized democratically, and not have our labor be organized by the tyrants of industry who act as gatekeepers between labor and the tools that labor uses.
I actually wrote a whole ass essay on how to talk about this topic, so feel free to dig through that if you want some perspective on the issue and give yourself some talking points to pull out when the topic comes up.
"What About the Small Business Owner?"
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I started collecting my posts on Pastebin because I have written the same essay hundreds of times lmao.
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Great work. I read all of it. My only criticism is the mention of Einstein and Salk, who were living under capitalism even if they didn’t believe in it. Earlier thinkers and inventors (like Da Vinci or Archimedes) might be better examples.