Why wouldn't it be?
The bacteria present in it are living creatures. Granted, we consume many unintentionally, but do you need to eat the ones trapped in your nose and crystallized into boogers?
It's (intrinsically) fine to kill non-sentient life. It's akin to unplugging a computer.
How do you define sentience? How are you able to say for certain that a bacterium is non-sentient but an insect is sentient, even though you haven't lived the experience of either?
Shouldn't you avoid harming bacteria just to be on the safe side? If you can just assume bacteria are non-sentient, then what's to stop a beekeeper from assuming bees are non-sentient and doing whatever he pleases?
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