For example, I certainly boycott anything to do with Elon Musk, for the same kinds of reasons.
You seem to be falling into the "perfect is the enemy of the good" trap. It's not possibly to perfectly boycott every person and organization that deserves to be sanctioned, but that doesn't mean we shouldn't do it where it is possible.
So lets only boycott small and inconsequential companies like Mullvad that are easily replaceable. However not companies like Apple, Intel or Nvidia etc. whose CEOs have expressed their personal admiration of Trump and supported him financially because it would not be very convenient?
To be fair that seems to be reasonably rational i.e. anthropomorphising lawnmowers is a fool’s errand while its feasible to actually make a difference in cases like this
I know that I'm an outlier but that doesn't matter to me. People can express their own moral (or immoral) choices, I can't control that. But don't tell me there's nothing you can do.