1. They're not actively malicious and have the emotional capacity to feel embarrassed
2. They know they were talking about her voice and making comparisons and that this is A Bad Look and they've had a terrible week PR-wise already
3. Might be a trademark violation, I'm not sure how that law works (in general let alone voice) but there's a reason why Pear Computer had to change their logo
1 is possible, 2 strikes me as unlikely (how bad of a week was it? I didn't get that sense). 3 doesn't make sense — this has nothing to do with trademark law. A logo is a 'mark' that identifies a brand, but a voice is not a 'mark.'
#2 because they're humans and humans act emotionally — it's entirely possible for them to just go "aaaa" like all the people in comments sections do regularly.
#3 famous people do seem to have some control over their likeness; I don't know how real that control is or anything about how it works, just that it looks like this from the outside. IANAL, so treat that as a claim of analogy not literal.
Several possible reasons.
1. They're not actively malicious and have the emotional capacity to feel embarrassed
2. They know they were talking about her voice and making comparisons and that this is A Bad Look and they've had a terrible week PR-wise already
3. Might be a trademark violation, I'm not sure how that law works (in general let alone voice) but there's a reason why Pear Computer had to change their logo