You are assuming a lot here.

One, I don’t coinjoin.

Two, I don’t have a problem admitting Bitcoin has fungibility issues, I just add the caveat “if you care about what a government thinks”. Note that I don’t care if a government calls Bitcoin “tainted” because Bitcoin exists outside of any governmental reach.

Three, you assume that I check it in any way care about a bitcoins transaction history when I transact with them. Here again, I don’t give a shit what it has or hasn’t been used for in the past. For me, one Bitcoin is the same as every Bitcoin. If that’s not the case for you, that poses no threat to me whatsoever. I see that as your loss, not mine. You are free to disagree, and not buy any of my tainted coins, ever, if you so wish. I’m not selling anytime soon anyhow.