Here is a thread of almost 300 posts from late 2020 on the topic of when & whether using the title “Doctor” is appropriate for both MDs and other flavors of folks with advanced degrees. Of course it was started in response to some RW jerkwad poking fun at Dr. Jill Biden.
This cite includes a reference to an earlier 100+ post thread about the same topic but started in reference to a non-celebrity PhD’s attitude to his title.
So this particular issue raised by Kelly’s current bloviations has already been well-litigated here.
None of which takes away from Kelly being a deplorable playing to the deplorable seats. But the “who should call themselves ‘Dr.’ when?” debate is a distraction from that righteous Kelly-bashing we all (me certainly included) enjoy so much.