What “evidence” is that? An out of context exchange, only covering a few texts, released only by one side who we know is already motivated to painting the other side in a bad light knowing that they won’t answer back.
And what exactly does that exchange show? absolutely nothing. I’ve had hundreds of text exchanges just like it without it being evidence of…anything.
We don’t know what happened before that exchange, we don’t know what happened after.
Same with the “baby brain” comments. What was the context? was that the only overly-familiar thing that Meghan had said?, had she done similar before? had she been asked not to do so already? Were there other complaints about her behaviour (There are reports about her bullying staff that are at least as credible as Harry’s report)
We have no idea what the run up, specifics or aftermath of that incident were other than what Harry finds convenient to tell us and I don’t find him a reliable witness to the extent that I’m going to condemn someone else on his word alone.
Also, remember that Kate had a pretty shitty time through all her pregnancies to the extant that she was pretty debilitated by them for long periods, I can well believe that such an experience might make someone rather sensitive to flippant comments by people they aren’t close to.
The fact that you read anything much into it is indeed evidence of your own admitted biases and a predisposition to believe one side over the other and prefer one side over the other. That’s perfectly human but a solid case it does not make.