I think if a close friend of mine had written a YA novel, I would buy and read it to support them but I genuinely cannot imagine buying and reading a YA novel just to get some kind of validation from the author on twitter.
I also saw the tweet from Charlotte BHC and thought that was aimed at Bethany! Obviously Bethany is in an extremely privileged position due to background and upbringing but I don't know enough about the publishing world to know if her success is due to that or if she is a genuinely great writer (or even just that there was a massive gap in the market for plus size YA fiction?).
Does anyone else listen to the What Page Are You On? podcast that she does? I really like Alice too and generally enjoy the podcast but I find Bethany's voice really distracting - it seems like such an affected way of speaking plus constant uptalk at the end of each sentence! Maybe I just don't hang out with enough privately educated people from the south east (!) but I've never heard anyone talk like that before and I find it really grating after a while!
She seems really happy with her husband, even if they are an unlikely pairing, no snark on that!