Considering that tweeting is predominantly performed by journalists, artists etc. (ie people with a public profile) I can’t imagine there are too many people posting such backwards views. So of the normal people you follow, a) they’d have to be fairly prolific tweeters (most people aren’t), b) actually be interested in Dr Who, a rather niche (these days) sci-fi programme and c) actually angry enough to tweet about it.
I doubt that these comments anywhere near balance those on the liberal side shrieking about “sexism”.
I track twitter very closely and follow a wide spread of individuals…the “outrage” is almost exclusively one-sided…and of those that may find the news of a female lead upsetting, it is such a minute number of individuals as to not even warrant discussion about it.